I just picked up a used LG G pad 8.3. It is coming off a fresh factory reset. last night I put it on the charger and this morning I checked and it was at 100%. when I got home from work it was dead. Is there anything I should check or any legitimate reason why my tablet would be dead after 12 hours of not being used? Is there something wrong with it? Should I initiate the return process with the seller?