Michal Slepanek

Hi guys........please,today my MB show me the message on dashboard MALFUNCTION(car with up arrow), but when i try offroad levels,all levels was reached without any problem with compressor overheating or something like that.When i turn off the ignition and turn on ignition again,message was gone.For a couple of hours i dont have any messages.After couple of hours i go for a ride in the city, i have this message again.I try offroad levels again and everything was in normal.Please can you give me some ideas where could be the problem.Sorry for my english im from Slovakia.Many thanks