selespeed jumping out of gear staying in 3rd
I have a problem with selespeed on Alfa 156 (1999 Model).
The problems started with jumping out of gear in corners or climbing hills (especially both of them) but sometimes also during breaking, while showing "3rd gear engaged".
Then we started having difficulty engaging reverse gear in the morning, it shows "R" as engaged but no movement (but after engaging 1st the reverse was possible again).
Finally we couldn't engage gear at all, so we had to be towed to our garage.
Our garage replaced the gear box after which everything was ok for 15 days (500km), then the same problems reappeared...
Now they are saying that the electronics are the problem and that that now needs to be replaced, and also that this electronics problem had been the cause of the damage to the original gear box.
We paid more than CHF 4500 for the first repair, and now they want a further CHF 3500 to replace the electronics.
We're in a mess - any recommendation?
Thanks in advance.