Electronic problems!

Hello! My Smart is having problems similar to Pocello’s! Almost every time I turn it on, the light flickers, I go off, lights up several lights in the speedometer and it goes off. Sometimes only the radio and light goes on and off. If I turn it on and off again, it usually goes on again! I had the same thing before last year in winter, you didn’t find anything in the workshop. Does one of you have any advice? I hope:-(