Out with a friend go to jump on plane about the time it gets on pad everything dies. Try to restart no power to key.let set a few minutes powers back starts right up go to jump on plane dead again.wait a few minutes fires right uP. When dead no beep for key on or anything. Checked battery connections all good. Funny thing is we were a couple miles from the ramp fired up third time idled all the way back no problem get close to the ramp try to plane dead again. Any ideas where to start. Thanks guys