RE: Need help with E-Maxx please
Just an idea here, but check your antenna wire. make sure there aren't any small cuts in it.
Only other thing I can think of is make sure your throttle trim is centered and run setup again on the ESC.
How fast does it come back on? If it's the thermal it should be at least 5 seconds. If it's a lot shorter time than that it may be a radio problem.