I began having a problem with my NEX 7200 after cleaning the screen with the unit off. I assume a tiny amount of cleaning solution caused the problem.
The unit is about a year old.
It has been about two weeks since this began so a drying out period has passed.
The problems are:
Erratic or no response to touch screen input.
Erratic or no response to hard button input.
Reassignment of some hard button inputs
Unexpected opening of the tilt screen without any input.
When in the Android Auto mode the unit seems to operate without some of these problems.
Pi