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How to Fix Computer Randomly Restarts on Windows

PC restarting by itself without warning? Fix random reboots caused by overheating, driver crashes, power issues, and Windows errors.

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Main Troubleshooting Guide

How to Fix Computer Freezing and Hanging

Complete symptoms, causes, and step-by-step solutions

Symptoms

You might be experiencing this problem if you notice:

  • PC restarts without any warning or error message
  • Restart happens during gaming or heavy workloads
  • Random reboots at idle or low usage
  • Blue screen flashes briefly before restart
  • PC restarts multiple times a day
  • Restart happens at the same time daily (scheduled updates)

Common Causes

  • CPU or GPU overheating triggering thermal shutdown
  • Unstable power supply under load
  • Driver crash causing automatic restart
  • Windows Update set to auto-restart
  • Faulty RAM causing random crashes
  • Overclocked components unstable

Solutions

Solution 1: Disable Automatic Restart on Failure

  1. 1Right-click Start > System
  2. 2Click "Advanced system settings"
  3. 3Under Startup and Recovery, click Settings
  4. 4Uncheck "Automatically restart" under System failure
  5. 5Click OK — next crash will show the blue screen instead of restarting
  6. 6Note the stop code to diagnose the root cause

Solution 2: Check Temperatures

  1. 1Download HWMonitor or Core Temp (free)
  2. 2Run the program and check CPU temperature
  3. 3Under load, CPU should stay below 85°C
  4. 4If temps are high: clean dust from fans and heatsinks
  5. 5Ensure all case fans are spinning
  6. 6Consider replacing thermal paste if CPU is 5+ years old

Solution 3: Disable Automatic Update Restarts

  1. 1Go to Settings > Windows Update > Advanced options
  2. 2Turn on "Notify me when a restart is required"
  3. 3Set Active hours to your working hours
  4. 4This prevents Windows from restarting during use
  5. 5You can also temporarily pause updates if needed
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