Sound has been working, but a weird quirk has arisen… Randomly, sound becomes disabled and then at some future time it becomes re-enabled on its own. No clue what is going on, but logging out and then back into my account does not resolve the issue while rebooting always restores sound.
My most-used sound-based application is YouTube using Chrome. This problem usually occurs when I leave the computer for some time and return. Sometimes sound is on, sometimes off, but it is not isolated to just the browser, it is system wide. I have tried multiple browsers and sound-based programs - when sound is off, it’s off for all applications. Also, this box is a file and webserver which runs 24/7.