Hi, I'm using my parent's iPad and I found a annoying problem which haven't been noticed before. Here is the photo, the area display well, but it does not respond to the touch or the pen. It was the situation yesterday night, and this morning the problem dispear temporally. Does anyone know the cause for this?Is a hardware isssue? Could I have a replacement in the Apple Store? Thanks! Btw I'm using air2 now but I really need the pencil function, still waiting the new pro so I won't have to using my parent's pro.