Yesterday morning again error 94, after puttting my battery in. Wigled the cableonnector and it was gone. In the evening when driving home had a powerdrop again. Also my battery does not last as long as before. It started after i put it away for winter. Battery inside my housr and bike in garden shed. This morning I had a look at the connector of the cable and I saw some discoloration on the big pins. Also some black spots were visible in the plug of the battery. I attached a picture. I think the pins corrode because of condensation of the cold weather. I cleaned them. I will let you know if this helps. 

The bad contact can indeed explain the more power use, error codes and powerdrop. 

@Electric thanks for the tip😉

So I read on French forum the same problem. They put special carbon electric conductive grease on the contacts and a foam on the removable lid. I will buy the grease, and try it. As it seems the collar on the connector is to big so when you torse the connector you pull on the wires inside what can cause also a problem.