panic (cpu 3 caller 0xffffff7f972b0a99)
Imac late 2013 21.5" suddenly restart also shows a small glitch from time to time behind the window or program that i'm working.
iMac 21.5″, macOS 10.14
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Start with this...
Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes or more.
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.