I can see you have Youtube open, suggesting to me that this laptop is not optimised ..try closing internet, disabling wifi and the other things suggested in the forums.
Get to KNOW your machine, every one is different, audio glitches are usually down to something causing a interruption in the audio stream,it could be wifi, RAID, some bluetooth, auto updates …the list is endless …
its a machine, things happen for no reason other than its an electronic device, I wouldn’t worry to much about it, sometimes all you have to do is just reboot