I use my SL55 (July 2002) only with Keyless-Go. After some electronic-related workshop stays I now have the following problem: If I park and lock the car and come back within 4 hours, then I can open the door normally, sit in it, and start the engine with the first push on the start button. No problem. If I come back after more than 4 hours, then I can also open the door normally, but at the first push on the star The key symbol comes in the display and the display “keys not recognized”. Only when I press the start button a second time, the engine starts. The difference is quite exactly 4 hours, i.e. after 3.5 hours of standstill, the engine starts regularly the first time, and after 4.5 hours never. It may sound crazy, but it annoys me very much. For the workshop the problem should be very difficult, because they only get a maximum try al Is there a problem like this before or does anyone know anything about it? Thank you. Falk Kuebler