Radio Jazz broken?

Dear Forengemeinde, I have had a problem with my original radio for 2 days (Jazz 1.4 Bj. 2/2002). CD player is ok but the reception part spins. Loudspeakers remain silent and nothing could be adjusted (transmitters, frequencies, etc.) It was striking that “TP” flashed. I went into the lower settings (press on button 2 seconds) but tried all possibilities unsuccessfully. After the battery was disconnected, nothing went at first but then suddenly after 5 minutes I was able to re-set the stations and everything worked wonderfully. After about hours I started the car and the radio had the same error again. Does someone have similar experiences and how can the error be eliminated? If it should be a gross defect, do you have experiences with the exchange of the radio (distributors, costs etc) ? Thank you very much!