Problems with video card? (Games crash, audio video cuts out)

[Microsoft Windows]

HiA few weeks ago, video games I was playing started crashing. I checked the GPU and CPU temperatures and sure enough, they were running hot even with the fans on full blast. I bought a laptop fan cooler and that seems to have kept the laptop at a good temperature (and games no longer crash), but I still think I have a problem because the audio will cut out while loading (turning the speakers off and on will fix it) and I have now noticed when I play any video - whether internet streaming or native file - it will stop after a minute or so. I think I have an issue with my video card (NVIDIA GeF

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