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bbfa235
(Get the code!)
The log in comment #9 still shows kernel problems in nvidia-modeset interleaved with pulseaudio underrun errors. It's hard to tell which is the real problem, if either, because any buggy kernel driver could cause such issues for everything else. It's just that audio and nvidia are the things logging errors.
Perhaps the first thing to try is to close Firefox, stop all audio output, and see if graphics problems occur during that time.
I know of no way to rule out hardware failure, but I think software failure is more common. So maybe also try a newer kernel like https:/