Your character walks on its own; the cursor slides without touching the stick.
The stick's potentiometer wears out. Stock sticks fail with use, every time.
We replace the stick module with a Hall-effect one: no friction, so it won't drift again. That's the whole point.
It depends on the model and on what we find inside, so we quote each repair individually. The diagnosis fee depends on the device, and you approve the exact repair price before any repair starts. If it can't be fixed, you only pay the diagnosis.