I've had a One (V3) for a few years with stock Navcore and maps. Used to visit this site for info when i had Win Mobile device.

The screen has started turning itself off after an hour or so, a simple tap brings it back. I checked the setting for this and it was correct.
I followed a tutorial on here and removed all files allowed 'Home' to re-install the firmware and i added some new maps and the problem still persists.

To me this sounds like a hardware issue - what are your thoughts?

Is this a common problem?

Is there anything else i can try?

would a different Navcore make any difference?

thanks for your thoughts