Default [Q] only middle of my touchscreen not responding

hi friends , help me regarding with this issue
i usually install custom roms and cheks whether phone is working alright or not . is it true a cutom rom makes touch problem orelse it happen due to kernal flash like overclocked ones . i dnt know about this but

IF THERE IS TOUCH PROBLEM OVERALL TOUCH MAY NOT WORK BUT IT DINT HAPPEN TO ME why only middle of my touch screen not responding