Strange random sound-does anyone recognize this?

Win10Pro said:

Sorry for being boring and repeating myself but I’m so curious about this case that I collected all your posts in one place and made another short summary:

1. I have all windows sounds disabled

Unless there is a Windows bug that disables not ALL the sounds, but 99%, we can at this point exclude completely Windows system as the source.

2. It happens when I am watching online videos. That seems to be the only time when it occurs + Volume mixer doesn't seem to help + I don't have firefox/chrome muted

I know it’s stupid but to be sure once and for all: could you watch online videos for a couple of days with your browser (in volume mixer) muted?

3. It's a new computer

Could it be a widget, background proprietary app, extra feature or whatever the maker of your laptop calls it to make it? Autoruns seems like a good starting point.

Don't apologize at all. It definitely is a weird ass thing.

#2: Unfortunately I just can't. I gotta relax some way on the computer, plus the sound doesn't even pop up every day.

#3 It's a computer I built myself. Did my best to find some thing, i.e. if it was an acer laptop it might have some proprietary app like you said, but I haven't been able to find anything.

Hey guys I attached a processmonitor file Uploadfiles.io - logfile.pml

The sound appeared around 10:32. If anyone would mind looking. I haven't been able to find anything strange, it's gotta be somewhere on the processmonitor....this thing is crazy!