Whatsapp callers suddenly hear echo on their end only

[Microsoft Windows]

After working fine for a couple of years, now whatsapp desktop is a problem - but not for me, for the person on the other end, who hears a full echo of everything they say. I don't hear any echo. And, when I try the same call on my mobile instead of desktop, no problem.This is recent, only the past 10 days or so.

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