Howdy. I just bought a new Galaxy S4, which I adore. Yesterday I went out to a landmark, in a remote section of the state. I had the main radio on and bluetooth. It was a 2 hour drive. When I got to the destination, I took out my phone to realize that there was no connection, battery life was down to 77 (from 100), and it was VERY warm to the touch. Is this normal, with it trying to find a tower incessantly? Or did I get a defective unit? I had turned on airplane mode and kept it so until I returned home in the afternoon, and it remained temperate. Thanks!