I have had a Retrosound Radio model one B in my truck for a while now and one day the USB mp3 playback just started to malfunction while I was listening to music on it. It said Error 4 and from then on it will not function again. I tried all the things that retrosound told me to correct it and none of them worked and then when I called back to tell them this they basically told me that I would have to buy a new unit. I wanted to buy their newer model for my 53 but now I am definitely having second thoughts since it broke after only 3 years of use and cost me $300! The main reason I bought this was so I could load and play my 50's music on demand when cruising and now it's just another fm radio. The fm radio isn't even that good with reception either. Has anyone else had this problem and fixed it somehow?