kitpzyxmsir said:
Have you got Core Temp displayed in the taskbar area? Also suddenly, that taskbar icon shrunk to about 1/3 it's size. Do you know how to re-size it? Nothing I try works.

I have it set to show temperature in the notification area by selecting 'Close Core Temp to notification area' in the Display settings. If you mean the size of the notification area text, the font and size can be changed in the settings for the Notification Area.

Windows Defender scan overheats my computer-image.png

If you mean the icon on the actual Taskbar, try rebuilding the icon cache.

Rebuild Icon Cache in Windows 10