Video Doorbell Pro: speaker "buzz"

May I ask whether anyone (else) is finding that their doorbell _ **SPEAKER** _ "buzzes?"In our case, the signal feeds through in a timely fashion (no time-lag issues: the internet connection is fine), but the speaker simply sounds like a bumblebee.Sound quality in the other direction is great: from the app (any device) you can hear very clearly whatever your visitors are saying to you.I assume the speaker itself is damaged or is "buzzing" against its frame. Is this a common/known issue of product quality? Or did I make a mistake in my installation method?