Same here. Three pairs and all had this issue after some time. One of the pairs was a used one with the same problem.

I had this problem! Then I cleaned the earwax out of the mics and it went away.

This is exactly why I will never buy them at all again.

For the price that is insane.

Yes, my AirPod Pros do this too, and I've found that the issue is due to a problem with the external microphones which are involved in active noise cancelling. In order to fix the problem I had to disable ANC, and use them like a pair of basic wireless headphones, which has been quite disappointing. I've found that basically any instance of dropping the headphones on a solid floor, even while in the case, will result in this rattling sound occurring.

I had this exact problem on my AirPod pros too! It is the internal mic, but if you forcefully suck the air out from the black mesh microphone openings, it gets rid of it.

There’s some random form of someone out there who figured this out, so credit to them, but this fixed mine (I couldn’t bear transparency mode for the longest time lol)