Richard Clark wrote:
. . .
As it appears to be temperature based (the reason why the fan appears
to be significant) and CPU based (over clocked for its operating
temperature); I would suggest trying to cool the CPU with an aerosol
(freeze mist) or one of those cans of air for keyboard cleaning.

You can use the "canned air" as a freeze mist ("spray cold"), or
vice-versa, by inverting the can while you spray. They contain
essentially the same stuff, the difference being that the "spray cold"
contains a syphon tube to suck liquid up while the "canned air" doesn't.

Roy Lewallen, W7EL