Mercedes 2014 C250 AMG. The instrument cluster lights have gone out. They went up again coincidentally after I had made a journey of approximately 150 km. And this became a pattern. After a while, a few days sometimes, the lights go out again and only come back on when I take a long trip. I believe the relevant thing here is that on the road I travel for a few hours at high speed, above those naturally low city speeds. Something related to the charging of the (auxiliary?) battery that powers the panel... Have you ever come across anything like this?