I had the same problem of FRITZNER with my Dietz 1280 saturday!!! After a long test of Movies with engine off in my EU-RNS-E the power from battery is normally stopped and when I restarted the car RNS-E had lost can-bus and in the source menu did not shows me TELEVISION and lights and ignition didn't work with RNS-E. I made a test of connection and everything was OK. I tried RNS-E without Dietz 1280 and it perfectly worked. I made a control of Dietz 1280 and it seems to be ok. Reinstalled Dietz 1280 everything perfect for 5 minutes and again the problem.Disconnected power from Dietz and reconnected and all OK again. Now it is working but i'm not sure....certanly the problem arrive from 1280 but I don't understand from what. It has perfectly worked for a month....