well first off, the titan is a battery hog, most htc's are. for starters make shure wifi did not turn on accidentally , wifi in it self will drain a battery in couple of hours, even in sleep mode. also take it out of you pocket. get a case for it, with it bouncing around in your pocket buttons get pushed , your phone gets turned on and off with out you noticing it. also your battery might be getting old and might need replacing. if your noticing changes in battery life with out much changes in habit , it might be time for a new one.