It is not a hardware issue and failing parts.
Mine used to be the same. It was great for few months, then i started to see the issue and it became worst until i have no choice but reset and reinstalling ios. Then again everything was fine until few week it started again.. after ios updates, it has been working fine until the issue comes always back after some time.
At the moment after the latest ios my ipad has worked well. No issue at all.
If it is a hardware issue, shouldnt it affect all the time and resetting/reinstalling doesnt do much then? Im quite sure it is software mixing the hardware rather than failing hardware components.
Why then people (me included) experience the same problem right after software reset? It is true that screen starts to become unresponsive after some time. But after it became unresponsive the first time the problem "sticks" to the iPad. It looks like a failed hardware component.