Hi Romcok,
I've not seen the problem now for almost 1 month after doing the following:
- run sfc /scannow (as administrator) .
- Installed intel command centre as disabled panel refresh (on battery and plugged in)
- disabled hardware acceleration on all office apps (including teams and outlook) and browsers (edge and chrome)
- updated the latest intel drivers (Version: 27.20.100.8187 released 5th may) https://www.intel.co.uk/content/www/uk/en/support/intel-driver-support-assistant.html
Like I mentioned above - I'm not sure which of the above solved the issue but I'm reasonably confident that its fixed now.