I did - called the Guru Repairman, that is.
Now I do what he said.
Shut down, restart. Daily,
If that fails, close everything. Shut down. Unplug the computer. Re-plug. Re-Start.
Now we will hear from the cognoscenti who will yell No! No! and yet again No!
Better check with the guy you bought the computer from. OR, Read The Frickin' Manual
Works every time.