I always blamed it on static electricity... it's happened several times with the Supero, until I started pulling my hair back everyday, then it's quit. But it's happened once with the Naida already.. It took months before the Supero started cutting off due to my hair falling out from behind my ear, and sometimes if I rub my head on the back of the recliner (I don't even mean to, it just happens), sometimes that would cause the Supero to cut off too. Hate when this happens. Once it cuts off, it never turns back on on its own, so I have to manually turn it off then turn it back on and it works fine again. So annoying. Don't know if it really is static electricity, but I don't know why else the hearing aid would cut off all of a sudden just because of hair falling from behind the ear.