wood123firebird

Hello everyone, new to the forum and need help. just purchased a 1998 slk 230 116000 miles, I had to replace the bulbs in the climate control backlights after i got the car becuase of a burned out bulb. after driving the car for a while, these lights will go out. If I cycle the light switch for the parking lights, the climate control lights will come back on and then go off again. Does anyone have ideas on how to fix this?
I have done some web searches and find nothing on this so I am guessing it is not a comon problem. Since it is winter here in new england and i am using the heater i was thinking it could be heat related but have not been driving the car long enough to know if it is or not. Thanks for your help in advance.