When I opened up my tablet at the end of last week there was what looked like a small crack on my screen. It hadn't been dropped since previous use and there was no physical damage to be seen or felt on the screen.
The screen goes between having rainbow lines on one side, black (which has got bigger) around the "crack" and clearly there is something to do with the touch screen as it jumps about when unlocked, opening apps and scrolling through, or flashing the screen on and off when locked.
I had a phone which had the rainbow lines problem a few years ago and it was a problem with the hardware, I'm wondering if this is likely to be the same? I'm a 6 hour round trip to the nearest Samsung store to get this looked at.
