I have the same problem, started two days ago, and the touch is okay at the top half, but shifted upward as I go to the bottom, about 1 cm, the bottom 1cm of the screen is impossible to use this way, recalibration does not help a bit. May guess was that the screen got pressed a bit too hard at a point and now is stuck at "pressed", and messes up all the touch events. Sadly my device is pretty old and the screen is scratched all over.
If there is no other way, I would gladly buy a replacement screen from someone.