macOS Sierra keeps freezing

I installed Sierra on my MacBook Pro a few days ago, and several times it froze. First the computer stops responding to my external mouse. About 30 seconds later it stops responding to the keyboard and trackpad. I have to force a reboot. Why is this?

Perhaps relevant: according to activity monitor, kernel_task frequently uses now several hundred (and sometimes more than 2,000) percentage of my CPU. Who would have thought that was possible?

Back up your Mac if you have not already done so. Read https://www.apple.com/support/backup/to learn how to do this please. To learn how to use Time Machine read to use Time Machine to back up or restore your Mac.

Then, shut down your Mac and restart in 'Safe Mode '. To learn how to do it please read: try safe mode if your Mac does not start-up. Compare works your Mac in Mode for how safe it was.

Then restart normally. If the same problem comes back, please read the section If a problem does not occur in safe mode for actions recommended to Apple.

Finally, you can temporarily create a new user account and log into this account to determine if the problem also exists when connected to this account. To learn how to read How to test a question to another user on your Mac account. When you are finished troubleshooting, you can remove the temporary user account by following these instructions: macOS Sierra: remove a user or a group. Before you delete, confirm that you have not need of all the files that you have possibly set in this account.

Let me know what you decide.

Tags: Mac OS & System Software

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