Pretty much every time I open my start menu and leave it open for a few seconds, I hear Windows Foreground.wav and From Microsoft Background Task Host starts up. It's from System32 and Process Explorer verifies it, plus says that it's the Content Delivery Manager. It doesn't make a nuisance of itself (no excessive memory, disc, or CPU usage), and goes away after a few minutes or so, only to return the next time I open my start menu. Process Monitor says the sound is from taskhostw.exe (again, legit and verified by Process Explorer), and the output says that it creates a file, runs two queries, and closes it, much like this, but turning off Notifications doesn't do anything to stop it. I've checked my startups and my task scheduler, nothing that could cause it in the former and I don't see anything that's off in the latter.
I've run ESET (online version), MBAM, MBAR, and ADWCleaner, so I'm pretty darn sure there's no virus or malware shenanigans causing this. SFC, DISM, and chkdsk turn up nothing out of the ordinary. Not even anything in the Event Viewer about it.
Is this just Windows 10 being quirky and something I have to live with, or can I at least get it to be quiet?