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Is the unwanted bit part of the countdown?
If so, there are a couple of ways to avoid it.
1. Don't record your narration at the same time you record the actions. Record it separately. No narration means no countdown.
2. After the countdown stops, consider that first slide to be a throwaway and ensure you don't begin recording in earnest until after you hear the first camera shutter sound.
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Not part of a countdown, just doing standard narration over a powerpoint slide. This began after upgrading to 4 never did this in 3
I also get an unwanted sound at the start of most of my audios. Not so much a "pop", but for sure I get a noise I do not want ~ and it appears just as you show on your screenshot.
To this day I have never taken the time to find out what causes it, rather I have just got into the habit of quickly editing it out at the same time as I do my other audio housekeeping, to remove my intakes of breath and other "off stage" noises etc., I dont want people to hear.
As I say, dont know what causes it, but I know how to quickly get rid of it.
Well I'm in the process of doing that now but I was hoping to figure out a way to stop it! That least it's just not me!