Default One X Touch display not responding, urgent help needed!!

Hi!
I've got this display issue that needs to beresolved, so please someone help me!
Symptos: after random period of time(5s-?s)the touch display no longer responds, sometimes it's enough to turn the screen off and on again to bring it backmto life, but sometimes it needs to be rebooted even several times :-/
Factory reset won't help.

Any ideas?

I 've bought is as a used one with custom 4.2 and have no idea or experience how to replace the rom, if it's a software issue.
Dont't have the original stock rom either..

Is there a foolproof step-by-step manual for users 1.0 like myself?

Thank you, appreciate any help

P


Update:

Someone checked the phone and i was told that a ROM for One V was installed, and that simply replacing it won't help 'cause it had written things to different places than the stock one would, so it just cannot overwrite it..
Does this make sense to anyone??
Is there a way to fix it?

Pls!!

Thank You!