Mine died Tuesday was on escribe because watts for preheat were feeling really hot all the sudden (starre ni200 coil quit during a burst put in New coil same thing) so was going to turn it down from 70 down to 60 changed it still seemed hot went to analyzer it said was hitting 100 w then dropping to 45 double checked everything disconnected usb made sure was on right preset got no atomizer signal tryed four different tanks no reading then it turned the screen off and would only come on with charger attached other wise it's dark if it makes any difference it's vape cige vt200 #3899 thanks oh I don't know where it was bought as I won it about a month ago in a raffle