For a few days now, weird cracking while playing games and watching videos?

I have a Gamin notebook and have been cracking for a few days watching and playing videos.

So I decided to write down and clean the notebook. After that it went perfectly again for about 4 hours but now it's back, and the sound is now and then asynchronous to the picture.

I would try to investigate the audio driver in more detail. There seems to be no loose contact after your interventions.