Cerbo GX, touch 50 not responding to touch correctly

My Cerbo GX touch screen 50 has worked for 2 years by simply touching it lightly. Now, I have to press it very hard in order to see any item. Scrolling through the various menus is also very difficult.
Question: Is there a touch sensitivity adjustment somewhere which can be used to reset the sensitivity to a normal touch?

Any assistance would be appreciated.