Set Avast to "Gaming mode" and uncheck sounds.
My only exception is during Avast's "Talk like a pirate" month (LOL), but I haven't seen that in years. Always got a chuckle - "Aye Matey! Scuttle them thar viruses..."
But, that's one of the problems with switching to Avira. Gaming mode is only available on their paid/Pro version so the popups are back. I tell my clients to upgrade their AV if it bothers them.
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