My AirPods 1 have developed a strange issue where they disconnect without warning and it appears the batteries are run dead after only about 10 minutes when on a phone call. When not on a call, like listening to music, they last abut 2 hours and never have any dropout or disconnecting issues. I know the battery life while on a call is much less but this seems a bit extreme. I'm still pretty happy with their performance when not making calls but they are now almost useless for calls. Normal "end of life" behavior or something else?