Radio rushes

Hello, I’ve had a Phaeton for about 5 weeks. and with me the radio is constantly rushing. Always at a distance of a few seconds a rush or crackle. Sometimes for a few minutes everything is OK, and then again. About CD everything is crystal clear, so I think lies at the reception. The soft and hardreset on the ZAB (audio key and then reset key for a long time) I tried out, but nothing changed. I was already 2 times in the workshop and then was told that we only have n 90% reception quality measured, is normal. That’s all we can’t do. Doesn’t know what that could be? If it’s nothing great, I’d rather screw around on my car myself. It’s really no fun listening to the radio. I had an A3 sportsback 6 years ago, where I didn’t hear a noise once. It was a “The World Car” Phaeton from 09/2008. The 3.0TDI with 239hp, so GP 1.5 or? I also have 11 months guarantee he on it. Otherwise I am super satisfied with the car and it just drives great. mfg Tino