Windows 11 Keeps Restarting by Itself — 9 Real Fixes (2026)

By Saif Khan  |  TechFix Radar  |  Updated: July 2026  |  10 min read

Your PC restarts without warning. No blue screen. No error message. Just — off, then booting back up as if nothing happened. Or maybe it does show a blue screen for half a second before restarting, too fast to read.

I have dealt with this exact issue on five different Windows 11 machines over the past year — a Dell desktop, two HP laptops, an Asus gaming PC, and a custom-built workstation. Every single one had a different root cause. That is the frustrating thing about random restarts: there are many possible causes, and you have to work through them systematically.

This post gives you a clear diagnosis path so you do not waste time fixing the wrong thing.

⚡ Quick answer:Random restarts in Windows 11 are most commonly caused by (1) a faulty or outdated driver — especially GPU drivers, (2) Windows Update restarting the PC automatically, or (3) overheating triggering an emergency shutdown. Start with Fix 1 (check Event Viewer to find the exact cause) and Fix 3 (Windows Update restart settings). Those two tell you exactly where to look.

📋 What's covered

1. Diagnose first — read the Event Viewer log
2. Disable automatic restart on system failure
3. Fix Windows Update forced restarts
4. Update or roll back GPU and chipset drivers
5. Check for overheating
6. Run Windows Memory Diagnostic (RAM check)
7. Run SFC and DISM — repair corrupted system files
8. Check your power supply (desktops)
9. Disable Fast Startup
10. When to consider a clean Windows install

Before Anything — Diagnose Using Event Viewer

Most people skip this step and spend hours fixing the wrong thing. Event Viewer shows you exactly what happened right before the restart — which tells you which fix to apply first.

DIAGNOSE

Read the crash log in Event Viewer

1. Press Win + R, type eventvwr.msc, press Enter
2. In the left panel: Windows Logs → System
3. Look for red Error or yellow Warning entries around the time your PC last restarted
4. Click on each one and read the General tab description

What to look for:

Event ID	What it means	Go to Fix
41	Kernel-Power — unexpected shutdown (most common)	Fix 2, 5, 8
6008	Unexpected shutdown — power or hardware issue	Fix 5, 8
1074	Windows Update triggered the restart	Fix 3
7034 / 7031	A service crashed and caused restart	Fix 4, 7
Memory errors	RAM fault	Fix 6

Event ID 41 (Kernel-Power) is the most common one. It means Windows did not shut down cleanly — something forced it off. This points to either a driver crash, overheating, or a power supply issue.

💡 Shortcut: Press Win + X → Event Viewer → Windows Logs → System → click "Filter Current Log" → Event Level: Critical + Error → this shows only serious events, cutting out the noise.

Fix 1 — Disable Automatic Restart on System Failure HIGH IMPACT ⏱ 2 min

FIX 1

See the actual blue screen instead of instant restart

By default, Windows 11 restarts automatically when it crashes — which means you never see the blue screen error code that tells you what went wrong. Turn this off first so you can actually read the error next time it crashes.

1. Press Win + R → type sysdm.cpl → Enter
2. Go to the Advanced tab
3. Under Startup and Recovery, click Settings
4. Uncheck "Automatically restart"
5. Click OK

Next time your PC crashes, it will show a blue screen and stay there instead of restarting. Write down or photograph the error code — it will tell you exactly what caused it. Common ones:

• DRIVER_IRQL_NOT_LESS_OR_EQUAL — bad driver → Fix 4
• MEMORY_MANAGEMENT — RAM issue → Fix 6
• SYSTEM_THREAD_EXCEPTION_NOT_HANDLED — driver crash → Fix 4
• KERNEL_SECURITY_CHECK_FAILURE — corrupted files → Fix 7
• WHEA_UNCORRECTABLE_ERROR — hardware failure, usually CPU/RAM

Fix 2 — Stop Windows Update From Restarting Your PC HIGH IMPACT ⏱ 3 min

FIX 2

Schedule restarts instead of letting Windows decide

A huge number of "random restart" complaints are actually just Windows Update restarting the PC to finish installing updates — often at inconvenient times like during work. This is not a crash, but it feels like one if you do not know it is happening.

Check if this is your issue first:

Settings → Windows Update → Update History

If updates were installed right around the time of your last restart — this is your cause.

Fix it:

1. Go to Settings → Windows Update → Advanced Options
2. Turn on "Notify me when a restart is required"
3. Set Active Hours to your working hours (e.g. 8 AM to 11 PM) — Windows will not restart during these hours
4. Turn off "Restart this device as soon as possible"

Fix 3 — Update or Roll Back GPU and Chipset Drivers HIGH IMPACT ⏱ 10 min

FIX 3

Bad drivers are the most common cause of random restarts

A corrupted or incompatible driver — especially GPU drivers — is the single most common cause of random restarts and blue screens on Windows 11. I have seen this cause restarts on three of the five machines I worked on.

Update GPU drivers:

• NVIDIA: Open GeForce Experience → Drivers → Check for Updates → Express Install
• AMD: Open AMD Software: Adrenalin Edition → Check for Updates
• Intel Arc: Intel Arc Control → Driver updates

If restarts started after a recent driver update — roll back:

1. Right-click Start → Device Manager
2. Expand Display Adapters
3. Right-click your GPU → Properties → Driver tab → Roll Back Driver

Also update chipset drivers:

Chipset drivers control communication between the CPU, RAM, and motherboard. Outdated chipset drivers cause instability that looks like random restarts. Download from your motherboard manufacturer's website (AMD, Intel, ASUS, MSI, Gigabyte) — not from Windows Update.

Fix 4 — Check for Overheating HIGH IMPACT ⏱ 5 min

FIX 4

High temperatures trigger emergency shutdowns that look like random restarts

When a CPU or GPU hits its thermal limit, Windows does not show a blue screen — it just shuts off instantly to prevent hardware damage. This looks exactly like a random restart.

Check your temperatures:

Download HWMonitor (free). Run it while doing the task that usually causes the restart — gaming, video editing, or even just leaving it idle. Look at:

• CPU temperature: should stay below 90°C under load
• GPU temperature: should stay below 85°C under load

If temperatures are high:

• Desktop: Open the case and clean dust from heatsinks and fans with compressed air. Check that all fan cables are connected properly.
• Laptop: Clean vents with compressed air. Consider replacing thermal paste if the laptop is 3+ years old.
• Make sure the PC has proper airflow — not crammed into a cabinet or against a wall.

Fix 5 — Run Windows Memory Diagnostic HIGH IMPACT ⏱ 15 min

FIX 5

Test your RAM for faults

Faulty RAM is a classic cause of random restarts and blue screens — and it is one that people overlook because RAM rarely shows obvious physical damage. Windows has a built-in memory test tool.

1. Press Win + R, type mdsched.exe, press Enter
2. Choose "Restart now and check for problems"
3. Your PC will restart into the memory test — this takes 10-15 minutes
4. After the test, Windows restarts and shows results in the notification area

If errors are found — your RAM has a fault. Try removing one stick at a time (if you have two) and testing with each separately to identify which one is failing.

For a more thorough test: Use MemTest86 (free, boot from USB). Run it overnight for 2-3 complete passes. This catches errors that the Windows tool misses.

💡 Quick RAM check: If you have two RAM sticks, try running the PC with just one installed. Alternate between the two over a few days. If the restarts stop with one stick removed, that stick is the problem.

Fix 6 — Repair Corrupted System Files with SFC and DISM MEDIUM IMPACT ⏱ 20 min

FIX 6

Fix corrupted Windows files that cause instability

Corrupted Windows system files can cause all kinds of instability including random restarts. Windows has two built-in repair tools — run both in order.

Step 1 — SFC scan:

1. Right-click Start → Windows Terminal (Admin) or Command Prompt (Admin)
2. Type this command and press Enter:

sfc /scannow

Wait for it to complete — takes 5-10 minutes. It will tell you if it found and repaired any corrupted files.

Step 2 — DISM repair (run after SFC):

DISM /Online /Cleanup-Image /RestoreHealth

This takes 10-15 minutes. It downloads replacement files from Microsoft if needed, so keep your internet connected. After both complete, restart and monitor for further issues.

Fix 7 — Check Your Power Supply (Desktops Only) HIGH IMPACT ⏱ varies

FIX 7

A failing PSU causes instant shutdowns that look like restarts

This one applies to desktop PCs only. A power supply unit (PSU) that is failing or underpowered cuts power instantly when it cannot deliver enough wattage — which looks like a random restart or shutdown. This is especially common if the restarts happen during gaming or other GPU-heavy tasks.

Signs your PSU might be the issue:

• Restarts happen specifically during GPU-intensive tasks
• PC restarts when you plug in an external drive or other USB device
• You recently added more components (new GPU, extra drives) without upgrading the PSU
• You can smell a faint burning or electrical smell near the PC
• PSU is more than 5 years old

How to check: Download HWMonitor and watch the 12V rail voltage while under load. It should stay between 11.4V and 12.6V. If it drops below 11.4V, your PSU is struggling.

If the PSU is suspected, borrowing a known-good PSU for testing is the most reliable approach. PSU replacement is the fix if it is confirmed faulty.

⚠️ Do not open a PSU to inspect it internally — capacitors inside can hold a lethal charge even when unplugged. If you suspect PSU failure, either test with a replacement unit or take it to a repair shop.

Fix 8 — Disable Fast Startup MEDIUM IMPACT ⏱ 2 min

FIX 8

Fast Startup causes conflicts that lead to instability

Fast Startup is a Windows feature that saves a partial system state to disk when you shut down, making the next boot faster. The problem: it can cause driver conflicts, incomplete updates, and system instability — including random restarts — especially after updates.

1. Press Win + R → type powercfg.cpl → Enter
2. Click "Choose what the power buttons do"
3. Click "Change settings that are currently unavailable"
4. Uncheck "Turn on fast startup (recommended)"
5. Save changes

Your PC will take a few extra seconds to boot — but this resolves a surprising number of post-update instability issues.

Fix 9 — Check for Malware MEDIUM IMPACT ⏱ 15 min

FIX 9

Some malware causes system instability and restarts

Certain types of malware — particularly cryptocurrency miners — push the CPU and GPU to 100% constantly, causing overheating and instability. Others corrupt system files directly.

1. Press Win + I → Privacy & Security → Windows Security
2. Click Virus & Threat Protection
3. Click Scan Options → Full Scan → Scan Now
4. This takes 20-30 minutes — let it complete

For a second opinion, run Malwarebytes Free — it catches things Windows Defender sometimes misses. Download from malwarebytes.com.

Quick Diagnosis Guide — Which Fix to Try First

When do restarts happen?	Most likely cause	Start here
During gaming or heavy tasks	Overheating or PSU	Fix 4, then Fix 7
After Windows Update	Update restart or driver conflict	Fix 2, then Fix 3
Randomly, any time	Driver crash or RAM fault	Fix 1, then Fix 5
On startup or shortly after	Corrupted system files	Fix 6
When plugging in devices	PSU or driver issue	Fix 7, then Fix 3
Started after a Windows update	Driver conflict or Fast Startup	Fix 3, then Fix 8
PC also runs slow	Malware or system corruption	Fix 9, then Fix 6

When to Consider a Clean Windows Install

If you have worked through all nine fixes and the restarts continue — a clean Windows install is the next step. It sounds drastic, but it is often faster than continuing to chase an elusive software issue.

Do a clean install if:

• SFC and DISM both report errors they cannot fix
• Restarts happen even in Safe Mode (which rules out most drivers)
• The PC is several major Windows versions behind and has been upgraded multiple times

Before doing a clean install, always back up your data. Use Windows Backup or simply copy your important files to an external drive. The install process itself is straightforward — Microsoft provides a Media Creation Tool at microsoft.com/software-download/windows11.

✅ Safe Mode test: Boot into Safe Mode (Shift + Restart → Troubleshoot → Advanced Options → Startup Settings → Safe Mode) and use the PC normally for a few hours. If restarts stop in Safe Mode, the cause is a third-party driver or software — not hardware. This tells you exactly which direction to look.

🏁 Where to start

Open Event Viewer first (Win + R → eventvwr.msc → Windows Logs → System) and find the error that happened right before your last restart. Event ID 41 points to power or hardware. Event ID 1074 means Windows Update did it. Then follow the diagnosis table above. For most people, Fix 2 (Windows Update settings), Fix 3 (driver update/rollback), and Fix 4 (overheating check) solve it. If all software fixes fail, Fix 5 (RAM test) and Fix 7 (PSU check) rule out hardware.

Frequently Asked Questions

Why does Windows 11 restart without a blue screen?

When Windows restarts without showing a blue screen, it usually means the shutdown was caused by hardware — either overheating (thermal emergency shutdown) or a power supply failure. Software crashes almost always produce a blue screen. Go to Fix 1 to disable automatic restart so you can see the actual error if it is software-related, and check temperatures (Fix 4) if no error appears.

Is Event ID 41 Kernel-Power serious?

Event ID 41 means Windows detected that the system was not shut down cleanly — something cut the power without going through a proper shutdown sequence. It is logged every time there is an unexpected restart or power loss. It is serious in the sense that it confirms something went wrong, but it does not by itself tell you what. Use it as confirmation that a real crash happened, then investigate the cause using the other fixes in this post.

Can a virus cause Windows 11 to keep restarting?

Yes — some malware, particularly cryptocurrency miners and rootkits, cause system instability that leads to crashes and restarts. Crypto miners push hardware to 100% load constantly, triggering thermal shutdowns. Run a full Windows Defender scan and Malwarebytes scan (Fix 9) to rule this out.

My PC only restarts while gaming — what is causing it?

Restarts that happen specifically during gaming almost always point to either GPU overheating, a PSU that cannot handle peak GPU power draw, or a faulty GPU driver. Check temperatures in HWMonitor while gaming (Fix 4), then update or roll back GPU drivers (Fix 3). If temperatures are fine and drivers are current, the PSU is the next suspect (Fix 7).

Will reinstalling Windows fix random restarts?

It depends on the cause. A clean Windows install fixes software-related causes — corrupted system files, driver conflicts, malware. It does not fix hardware issues like faulty RAM, a failing PSU, or a dying hard drive. If restarts happen in Safe Mode or immediately after a fresh install, the cause is hardware.

How do I stop Windows 11 from restarting automatically after updates?

Go to Settings → Windows Update → Advanced Options. Set Active Hours to cover your working day. Turn on "Notify me when a restart is required." This prevents Windows from restarting during your active hours and makes sure you always get a notification before any update-related restart.

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Found which fix solved your problem? Drop it in the comments with your PC specs — it helps other readers narrow down the cause faster.