Re: my HTC 1x phone restarts after some time
Define "some time". A few seconds? Probably the power button is stuck in or the power switch is shorted. From minutes to hours? It could be anything from a bad battery to a bad motherboard.
Anything other than a truck power button, and it has to go to the shop. If the power button is stuck, you won't get any response from it. Just carefully pick off any dust or lint around the edges of the button with the pointed end of a wooden toothpick until the button moves freely again.