I've connected both a 160GB iPod Classic (using the VW OEM MDI cable) and a 16GB iPod Nano (current gen, using the VW OEM Lightning MDI cable). Every so often the iPods lock up. They still have power, but I have to reset them. It's not that common, maybe 5% of the time I'm in the car, but I can't seem to figure out what is wrong. I've restored both of the iPods but they both still do this, so I'm wondering if it's something with the head unit instead. Car is a 2013 Golf R with the RNS-315 navigation/Dynaudio stereo. Don't have this problem using Bluetooth audio to stream from an iPhone 5, nor has the stereo locked up when I used to use the SD card, but I prefer to just have an iPod in the car instead.