ELTEL71

Please can anybody help . My car comes up with a fault after driving a few miles the heating controls go off and the camaras stop working. If I stop and turn off the engine then turn it back on everything is ok again. The same thing happened last winter. Then during the summer it went Ok. I am not using the car a lot sometimes only twice a week. I had a new battery about 4 years ago. I drove about 10 miles today before it today. Does any know what is causing this Regards Terry