As soon as I restarted my Win10 64 system and resumed playing the movie I was watching just before upgrading from Avast Free Antivirus 23.5 to 23.9, my audio started having issues.
Every 30 seconds or so, I get a couple of seconds of delay (for example, a word gets repeated) and noise.
I guess the "culprit" must necessarily be Avast, as no other changes have been made to the system.
PS.
I posted a similar message as a separate thread, but then I thought that maybe it could be more relevant here.