My Dell Venue 7 3740 recently developed a bad habit of shutting down whatever app I am using and going into a reboot loop that I can only stop by holding the power button down for 5-6 seconds.  Battery charge or even being on the charger while in use makes no difference.  I have held the power button down for as long as 30 seconds which seemed to help but not cure.  I really liked this device and have used it for over a year with no real problems till now.  Anybody have any ideas or suggestions? HELP!