Volvo 850 Radio goes on and off while driving

Hello together I have a problem with my Volvo 850 built in 1993. And that’s when the radio has recently turned on and off. When I hit left the radio goes on at a certain point and when I put the steering wheel back on straight place the radio goes off. Sometimes the radio goes off completely and sometimes only the music. I have already looked if a cable rubs somewhere at the steering column. But that’s not the case. I hope someone can help me.