While I was driving the speedometer of my car suddenly dropped, and both kilometer counters stopped further registering. After a while the speedometer started to work again for approximately 100 km. Than again the same situation: no indication of speed, and passed kilometers. It happened 15 days ago and speedometer and mileage counters turn on and off without any sense. While they don't work, after few minutes two yellow warning indicators appear. When speedometer and mileage counters begin to work correctly, above mentioned yellow lights disappear. It seems to me that a contact is partly lost, or a wire is partly broken. I drove my car to an official Opel service, but they don't know what is the cause of the problem, and how to repair it.
Looking forward for your help, thank you in advance.