Ive had a strange problem pop up in the last week. My N810 is almost always on the charger when at home...was sitting on the couch watching tv and had it off the charger , it had not been off long and it beeped saying to recharge the battery and shut off. Then tonight I was out and about for a few , N810 in my pocket (fully charged before leaving the house), and i needed to make a phone call...so i stopped where i knew there was an open access point and tried to dial...and it did it again. beeped saying to recharge battery and shut off. So I put it on the car charger , it wasnt even on there 5 minutes and it said the battery was fully charged. Any idea what is going on?