This issue is very bad, and I've had it on all 3 of the sets of AirPods pros I have owned.
Another issue I have had on all three is that the noise cancelling degrades over time. When you get a new set, it's kind of night and day how good they are at first. After about 6 months I would say that they noticably suck compared to how they are when you first get them, and they just continue to degrade over time.
My guess is just wax and gunk getting to the external microphone mesh over time, but there is no way to deal with it that I can see short of buying another pair.
Another issue I have had on all three is that the noise cancelling degrades over time. When you get a new set, it's kind of night and day how good they are at first. After about 6 months I would say that they noticably suck compared to how they are when you first get them, and they just continue to degrade over time.
My guess is just wax and gunk getting to the external microphone mesh over time, but there is no way to deal with it that I can see short of buying another pair.