1. Device repeatedly shutting down due to overheating message. 2. Battery life is terrible now. I am running KitKat 4 4.2. I've read posts regarding these two issues appearing after the 4.4.2 upgrade. Some say to send it back to Samsung for repair. My unit is over a year old so there's no warranty remaining, and some posts seemed to indicate it was difficult to get any real satisfaction from Samsung. Rollback to the previous software version? What is the most effective course of action?