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The dock on my Mac mini keeps shrinking and expanding horizontally (only by a bit) every second. It's an M1, 2020 running Mac OS Monterey 12.4. Here is a video of the issue: https://youtu.be/Vx3p8K488Ug
Mac mini 2018 or later
It looks like as if there’s an app that opens and crashes instantly in a loop which causes the dock to expand and shrink continually in the video you posted.
To test that theory, if you restart your Mac by following the steps under “Temporarily prevent items from opening automatically when you log in” in https://support.apple.com/guide/mac-help/open-items-automatically-when-you-log-in-mh15189/mac, does the problem reproduce?
It looks like as if there’s an app that opens and crashes instantly in a loop which causes the dock to expand and shrink continually in the video you posted.
To test that theory, if you restart your Mac by following the steps under “Temporarily prevent items from opening automatically when you log in” in https://support.apple.com/guide/mac-help/open-items-automatically-when-you-log-in-mh15189/mac, does the problem reproduce?
Run the Terminal Command below
killall Dock
If still having issues >>
1 - Restart in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.
2 - Does the issue present in this mode ?
3 - Sometimes a Safe Boot followed by a Normal Boot will just put things right.
4 - If not - there could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.
5 - If the issue is present in the dummy account - then, this appears to be a System Wide issue on the computer.
6 - If after performing each of the above steps is the order that have been presents and still have issues - please advise for possible further assistance.
That was it! It was Synergy (software KVM) that was causing the issue. Thank you!
My dock keeps shrinking and expanding all by itself every second
