I'm also carefully positive this is a software issue, as it comes and goes. [...] So, speaker drivers?
Still no durable solution, I think the quickest way to solve it temporary is like @Norde said by following these steps.( By the way, thanks @Norde , this solution realy helped me a lot! )" -> i.e. these steps: Go to Start , enter Sound, and select Sound Control Panel from the list of results. On the Playback tab, right-click (or press and hold) the Default Device, and then select Properties. On the Advanced tab, under Default Format, change the setting, and then retest your audio device. "
This is sounding like a heating issue since does not happen for a few hours. Does any part of the case feel hot ? HWMonitor or another temperature monitoring program might show a long gradual rise in something.
I know this is probably not a good answer since never have had the problem but if I did and could not find a source, I'd try an inexpensive USB sound adapter and see if the issue is repeated or solved.
The issue is more noticeable when the Windows power settings slider is set to "Best battery life." Setting it to "Best performance" will make the cracking less annoying, at the expense of higher power usage.
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