That is really strange and interesting and was reproduced on every AirPods I've seen.
If you are using both AirPods and then start pushing them into your ears with your palms (like in this photo):
- For some time sound will start jumping from one ear to another.
- One AirPod will stop working.
- If you remove this AirPod from your ear music will not be paused.
- Put it back then in some time it will be back to work.
Any ideas what is the reason for this effect?