Hopped in my car after work on Friday and the thing was dead. The car unlocked and the doors opened. Screen was black, nada. Held the two scroll buttons to try a reset, never got the "T" to pop up on the screen but after about 45sec the car woke up. Any idea what could have caused that? Is that something that happens from time to time. When I parked it I had about 77mi left of range and it was about 30deg here in Chicago. When the car woke up it showed about 74mi of range.