JK,
Had the exact problem you do.
I believe it's the potentiometer- either bad or dirty.
You can test the voltage & replace or you'll have go replace the joystick.
Macro
Well jankees, it's a good thing i stowed away in the back of the Black Widow! Would have been alone!
Great collection- getting into Oshkosh a little early I presume?
Cheers