Hi guys,
I also have a similar problem.

I have a Linde 39X H50D, Model 2005, 2 months ago we started to have L231 and L236 error code sometimes during operation when I'm using joystick to tilt the Mast.
When any of these two error codes appears, joystick stop tilting. When I restart the engine, error disappears for 30-60 minutes then it's coming back again during operation.
Now, randomly, errors appears each 5 or 10 minutes.

I tried sprays to improve connectivity, but it didn't worked.

Please some one advise me, should I buy a new Joystick?
And If yes, do I need a software to learn the new joystick to the system?