Hi

After some experiments(i tried to change gear from 5 to 6 in manual mode when RPM was 1300 and speed smth about 50km/h) to check at low rpm vibration I got two faults
on the panel

Transmission fault selected gear only

and in the ECU
U12287 lost communication with dynamic control moduł
P0929 Gear Shift Solenoid Control Circut Range/Performance

My mechnics check all connectors including those near the gear shift knob and after that all faults gone
He tried to find excatly was was wrong and after the second checking faults back

any idea? its looks like harness releted or connectors?
Does gearshift solenoid could working one time and not working another ? Do I need considering to buy new gearshift with electronics?

I cannot check it deeper (via IDS) I have 130 km to closest authorised dealer...