Question Games keep crashing or freezing with rainbow screen glitch - DELL G15

Aug 1, 2024
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Hi all please could someone in the know help identify what could be causing this issue - think the behaviours are related.

Whenever I play a game on the laptop it runs ok for anywhere between 15 mins to 1 hour and then either:

1) Game crashes unexpectedly, "submit error report" box pops up; or
2) The laptop freezes and the image on the screen glitches, all the colours cycle/flash cmyk/rainbow colours. Laptop totally locks up and I have to do a hard reset.

I have tried:
- Keeping the laptop & power supply cool by elevating them and placing them under a fan, both are cool to the touch when glitch occurs
- updating all graphics drivers, bios, etc. available using the Dell support tool
-doing a system and hardware scan using the support tool (no issues)
-reinstalling/repairing Microsoft c++ (all versions where possible)

Anyone have any ideas on what could be causing this to happen, particularly the hard crash?