Although a newbie, I have had this problem too, because I have a large address book. It does take a long tim to download, and seems like iot will never finish, then it does. However when it does freeze, the way I got mine to finish the job was to connect it to my laptop by USB and sync it through BB manager. Then it took awhile, but finished. The problem I still have, is that after that, I can't activate my business e-mail account.
i have same issue with a world edition. all shows complete and all is working fine but still at 98%. re-pushed service books already and re-pulled battery.