having the same problem with mine, Using alfa diag I have individually tested the gear change actuators - no errors appear on the results- but I did notice that the odd gear change actuator sounded a lot quieter. The ECU (selespeed) had two errors recorded, one relates to a open relay within the ECU (?) I intend to get some contact cleaner today to attempt to reseat and clean all the cables and connectors hopefully sorting any poor connections.
If this fails then I will probably get a new battery, if that fails then I guess the accumulators may need replacing.
I have a 147 -