VKB-SIM

Hello there
I acquired a like-new GF MKII a week ago.

I‘ve been using it for Star Citizen than suddenly the X-Axis stopped working.
What I‘ve done so far:

Used the test app from VKB: not showing movements in x (all others are good)
Flashed the newest firmware a second time
Reset the joystick
changes USB and tried out a USB Hub
Reattached the grip firmly
Opened bottom plate: all plugs seem correct, green led ok
Tried PC controller software: same result, not showing x-movements
Detached all other USB devices

Is there anything else I can do?
I just ordered a twist module which should arrive today. I hope I can fix it soon

THX for your help!

Screenshot of Profile/Axes/Physical and Logical Axes please, don't crop the window.