Ghost inputs on volume input on recent OS releases

[SpoiledMilk]

I've been playing with new and different OS images on SD cards on my pinephone pro since I got it. I noticed about 6 months ago the latest Mobian release I imaged would show random but very regular volume changes to the internal speaker. Looked like a hardware issue at first, but the problem followed the software I was using as going back to an earlier release or a totally different OS made the problem go away. Today, all the well supported releases seem to have the same bug. The strange part being that I can't find any other posts with the problem. Is there some combination of things on my system causing this?