Hello,
it all started last sunday. Leaving my garage, the rear brakes was kind of stuck after releasing it. All was looking good after a few feet and i was expecting some rust and need for a good rear brake cleanup.

While riding, I got a message of a malfunction of the hand brake system that dissapeared after 2 seconds.

Yesterday, I even got a stabili track warning and other things. In the evening, i worked on my rear brake and cleaned/grease everything.

Today, i went well for a few miles and now i got a christmas tree in the dash:


I thing of an elecrical problem of some sort but I don't know where to start ?

Can it be a weak battery ?

Thanks for your help !