Skywriter xl - raspberry pi 3

In meantime I’ve tested the board further… The board keeps behaving very strange. Since today it can not anymore recognise any gesture (left, right, up, down, etc…) I’ve followed a solution on [SOLVED] Fullsized Skywriter Problem, but this didn’t help.

Any suggestion? (It does give me x,y,z values in the test.py file)

Furthermore, the test.py script stops regulary to go in a loop about 1.1.18;p:Hills Got firmware info. Why does this happen?