Does rebooting the device help you? In my case it almost always helps for some time, but then the issue returns (usually really soon, within few hours).
[doublepost=1553431425][/doublepost]Look here is a video I took of me using Paper app. Each stroke is supposed to go from top to bottom. Several strokes are not fully registered.
[doublepost=1553431538][/doublepost]And here is 2017 thread with some recent answers on iFixIt, (sorry if somebody already linked earlier in this thread) with several hundred answers:
https://www.ifixit.com/Answers/View...touchscreen+is+unresponsive+from+time+to+time
[doublepost=1553431425][/doublepost]Look here is a video I took of me using Paper app. Each stroke is supposed to go from top to bottom. Several strokes are not fully registered.
https://www.ifixit.com/Answers/View...touchscreen+is+unresponsive+from+time+to+time