How to reset the SMC of your Mac and perform this action 3 times consecutively ( Bong one, Bong 2, Bong 3 ) and release the key combinations.
1 - Suggest restarting 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 - 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.
4 - If the issue is present in the dummy account - then this appears to be a System Wide issue.