I am not 100% on this but how many of you are using a task killer? I had the same issues so I began deleting apps except the atk since I was told by my sprint rep that I needed it for battery life, nothing worked. So it came down to factory reset. Since the reset I did not download ark and let Android do its thing, phone has been AMAZING since then, not to mention I can easily get 18-24 hours out of my battery with moderate/heavy usage which was not the case before the reset. I'm no computer or Android expert, bit as far as my own experience, I am pointing my finger at atk's. Hope this helps!