I updated to Android 4.3 a few weeks ago, without any glitches, worked fine until...
I returned the phone to my dealer and after a day, I got a message that the phone has to be shipped to HTC for further repair attempts.
I had the same thing with my old HTC One V, just died. searched the net and found several others with the same problem, seemed to be common fault. Got it repaired, worked fine since then. I also did a search for problems with the ONE, but found nothing.
Could it be the same with the ONE? Probably I'm one of the first with this problem, and we have to expect a lot more of this?
Others with the same problem?