macOS Big Sur issues and how to fix them

macOS Big Sur (macOS 11): Troubleshooting Common Issues and Solutions

Released in November 2020, macOS Big Sur marked a significant design overhaul for Apple's operating system. While a major upgrade, it also introduced several known issues. This guide covers reported problems and their solutions. Consider using a suite of helpful apps to proactively address potential performance and data issues.

Addressing macOS Big Sur Problems

Here's a breakdown of common macOS 11 problems and their fixes:

• Download Issues: macOS Big Sur may fail to download or download extremely slowly.

  • Compatibility: Ensure your Mac model is compatible (MacBook 2015 , MacBook Air 2013 , MacBook Pro 2013 , Mac Pro 2013 , Mac Mini 2014 , iMac 2014 , iMac Pro 2017 ).
  • Internet Connection: Verify a stable internet connection; use a network utility like WiFi Explorer to diagnose Wi-Fi problems.
  • Apple System Status: Check Apple's system status page (apple.com) for server outages.
  • Incorrect Version: If downloading macOS 10.15.6 instead of macOS 11, follow these Terminal commands (execute as root): /System/Library/PrivateFrameworks/Seeding.framework/Versions/A/Resources/seedutil unenroll, then /System/Library/PrivateFrameworks/Seeding.framework/Versions/A/Resources/seedutil enroll DeveloperSeed (if applicable). Check Software Update again.
  • Disk Space: Free up at least 15GB of disk space using a utility like CleanMyMac X to remove unnecessary files and optimize storage.

• Installation Issues: macOS Big Sur might get stuck during installation.

  • Safe Mode: Reboot in Safe Mode (hold Shift during startup) and retry installation.
  • NVRAM Reset: Reset NVRAM (Option Command P R during startup).
  • SMC Reset: Reset the System Management Controller (SMC) – instructions vary depending on your Mac model (refer to Apple support).

• App Launch Problems: Apps may fail to launch or launch slowly.

  • App Notarization: This was a temporary server-side issue during the initial release; it should be resolved now.
  • Login Items: Disable unnecessary login items in System Preferences > Users & Groups > Login Items.
  • System Clutter: Use CleanMyMac X to remove unnecessary files and optimize performance.

• Boot Issues: macOS Big Sur may fail to boot.

  • Force Restart: Force restart your Mac.
  • Power Supply: Check power connections.
  • Different Account: Try logging in with a different user account.
  • Recovery Mode: Boot into Recovery Mode (Command R during startup), use Disk Utility's First Aid, and reinstall macOS.

• Freezing and System Restarts: Unexpected freezing and restarts may occur.

  • Performance Optimization: Use CleanMyMac X's Maintenance feature to run maintenance scripts, free RAM, and optimize performance.

• Battery Drain: Faster than usual battery depletion.

  • Activity Monitor: Use Activity Monitor's Energy tab to identify energy-intensive apps.
  • iStat Menus: Use iStat Menus for detailed system monitoring and energy usage tracking.
  • Battery Extender App: Consider a battery optimization app like Endurance.

• Bluetooth Problems: Bluetooth connectivity issues.

  • Bluetooth Reset: Press Shift Option, click the Bluetooth icon in the menu bar, select "Reset the Bluetooth module," and restart your Mac.

• Slow Performance: Overall system sluggishness.

  • Login Items: Disable unnecessary login items.
  • Performance Monitoring & Cleanup: Use iStat Menus and CleanMyMac X for monitoring and cleanup.
  • SMC Reset: Reset the SMC if other solutions fail.

• Network Problems: Wi-Fi connectivity issues.

  • Network Reset: Reset network settings in System Preferences > Network > Wi-Fi > Advanced.
  • WiFi Explorer: Use WiFi Explorer to diagnose Wi-Fi problems.
  • SMC Reset: Reset the SMC if necessary.

• USB 2.0 Issues: Connectivity problems with USB 2.0 devices (primarily affects some 2020 MacBook Air/Pro models).

  • Restart: Restart your Mac and try reconnecting.

• Missing Menu Bar: The menu bar disappears.

  • Fast User Switching: Disable "Show fast user switching menu as" in System Preferences > Users & Groups > Login Options. Then disable Fast User Switching in the new Dock & Menu Bar preferences.

This guide provides solutions for many reported macOS Big Sur issues. If you encounter problems not listed, consider performing a system cleanup to optimize performance. Remember to back up your data before performing any major system changes.

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