Thanks. I changed the battery a year ago, the original one ageing badly. I will double check the condition of the new one and especially the alternator charge.
As the issue occured after 500 kilometers drive, I would suspect the battery was fully loaded by then.
I had a look at connectors in the fuse box, cleaned them and sprayed some contact cleaners. The problem hasn t yet reoccured, but I haven t driven the car much since
