my C4 is here – a few questions

hello!! since the day before yesterday I have finally found my black C4 coupe VTR – super car.. now I have a few questions in the last 2 days..vlt. can answer the someone fix.. – I have found that the radio, as soon as the engine is off, goes also after 15-30min in the save mode and I then get it no more (motor should be left out).. now I have read in another thread that this is the ECO mode and that you can extend it with the dealer, voice mt that? some said yes, some said no.. – what bothers me on the radio is that the radio runs out immediately when the engine runs out..I would like it to go out only when I pull out the key..is it going to change somewhere, or can the workshop? – I burned 2 CDs (normal audio mix cd’s) to listen to music while driving..but almost every 2nd song has cracked, hacked and stuff..I then burned the same cd again slower, but exactly the same thing.. about problems known? or should I try other blanks? (original CD’s I haven’t tried yet..) – go to the topic: your opinion? the dealer said that the motors are not so zimperlich today..until the first free maintenance calmly, no red speeds but up to 4000 rpm it would be ok…your opinion?