Hi, I have encountered the same problems during telephone conversations with my iPhone 11 Pro iOS 15.1 and my AirPods gen 2. The problem occurred after the firmware update of the AirPods and thinking that they were broken I requested a replacement under warranty . When I got the new AirPods, they had the old firmware and worked fine. Shortly thereafter they updated to the new firmware and started having the same problem again. The problem, I noticed that it occurs ONLY if my smartwatch 3 Armani is connected to my iPhone, if I disconnect it from Bluetooth, the problem does not arise. I hope I have been of help and that the problem will be fixed with new firmware soon. Greetings