Both phone and tablet are overheating. Phone is restarting for no reason even during a call. Battery is set to give longest life but only holds a charge for a few hours even when not in use. Cannot locate how to update the firmware or software for the phone. All apps are updating correctly. This morning the phone crashed while idle and the dos style prompts initiated. It requested I make selections to update the firmware and/or software but when I selected these it would not do anything just sent me back to the menu. The only selection allowed was to "reboot phone" PLEASE ADVISE!!