This is, apparently, a known issue. My screen started doing it today too. (Got my laptop on Tuesday, didn't start until 2 days later, but I've mostly been running games until today.)
There are several threads on Reddit about it. From one of the posts:
It's believed to be something to do with the drivers on the Radeon chip. if you press Windows+shift+ctrl+b it'll perk the computer back up because it actually boots the drivers again on the chip. Most haven't had issues with it while running games(since it switches to the RTX, and it's a Radeon issue.) Also try turning Freesync off in the radeon chip settings, it's under Radeon Lite(in your programs)
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