My iPhone4 has started a new behavior that I've not seen before. I've got 1.5 gigs of music stored on the phone with 19.8 free. If I attempt to manually manage the phone and copy tunes over to the phone it used to do it without complaint. Now it seems to start copying and then abruptly stop. For example, copying eight songs off of a CD I've ripped will possibly copy one or possibly two songs but not the rest. If I highlight the uncopied songs and drag it over to the phone it just sits there like I did nothing. It's baffling. It does this whether I use wired or wireless sync. Mac OS X 10.73 on a Corei7 iMac with 16 gigs of ram, iTunes version 10.6. No jailbreak: stock 5.1.1 IOS.