Digital radio no receiving station change

Hello Recently the following occurred. While DAB reception evening in Frankfurt (V90, BJ 2018, km approx. 10,000) showed display the turning symbol and there was no signal available. I tried to get out of the DAB specification to switch to analog radio. But I didn’t succeed. Maybe I did something wrong. What exactly do you have to do to change the radio or how do you turn it off? Normally you can “turn off” the radio by pressing the volume button on the right radio reception. After a long drive and later switching to the highway somehow the radio caught again. Thanks for feedback. Jochen