Wondering if anyone has experienced this before. I've got a 160Gb iPod Classic, I think it is 4 years old. Works perfectly apart from the fact that it's incredibly slow when using the scroll wheel to move around. There's a huge lag and sometimes I struggle to get where I want (seriously spent a full minute last night just trying to land on the Playlists menu option!). I've got about 85 Gb worth of music on the device. Any reason in particular for the slowness or is the issue maybe to do with the scroll wheel losing sensitivity?