Dashboard Lights Go Off and On?

Start with your local auto stores - AutoZone, Advance, Car Quest, Pep Boys, NAPA, Discount, and Google Auto Part stores foreign with your zip code; start taking to each one to see if they will run their diagnostic machine on your car.
This is a free service and some stores have more elaborate machines than others. Keep going until someone finds the problem.

This is probably a short in your electrical system and one of the most complicated things to find and repair.

Sometimes it is just a faulty fuse but usually in the wiring. This may be in your electrical harness and that might have to be replaced (which will be very expensive).

Just try these auto parts stores first before taking your car to a foreign service shop so you will know a little about the problem before they tell you their diagnosis.
This is a safety hazard as it might cause more damage like a shortage and burn up the wiring system.

I don't think a normal garage will be able to fix this for you. There is a short in a circuit board that needs to be replaced. I am assuming this is a newer model Mercedes and most of the parts on the car is electronics.

If the garage does not have the right tools and testers they will never be able to find this. You need to get a full diagnostics run on the car electronic system in order to find this issue.

You should take your car to a garage that specializes in European car repair or Mercedes Benz. These shops have special computers and diagnostic machine that they hook up to your car to pin point the issue.

There is something somewhere with your electrical system!