I have had a few different times over the last couple weeks where I will be in a conf room at work where signal strength is hit\miss. My phone will be very warm to the touch and my battery will be just about dead. When I went into the conf room my batter was over 90%.. Hour later the phone is very warm and the battery is less then 30%... Never had this issue for the last 1.5 years I have had this phone.. Anyone have any idea?