I mean, I regularly leave them on a shelf in my apartment and they apparently do not consider that "down" or "stationary" enough to not just drain the battery completely. Truly a bafflingly bad design from the company that is (was) known for great hardware design.
This isn't bad design, it's a bug the vast majority of us don't seem to experience. Try the suggestions people have offered to reset them, it should fix the issue.
