Thanks, I'll keep an eye on that so see if it solves the problem. It's always been a mystery why I hear it on some videos but not others. Perhaps this is it, as strange as it sounds.
Just a quick note to say that I am experiencing this issue on my R5 as well. It does not happen on every video, I'd say around 50% or so. Sometimes I'll take two videos and one is fine and the other has the popping noise. I've tried turning AF off, e...