This is getting very problematic. Every once and a while, Apple forces people to change their AppleID password. After you change it, EVERYTHING breaks. iCloud, iMessages, FaceTime, iTunes, AppStore, iOS backups, etc etc. Then you have to go into EVERY single app (and system) using your Apple ID to reset EVERY password. ON EVERY DEVICE. So once you change your password (forced by Apple), you need to change 5-6 password PER device. This happens every 6 months (maybe shorter) I think. So if you have like a Mac, iPhone, and iPad, once Apple forces you to change it, be prepared to change your password 15-18 times. If you don't you won't receive iMessages, you won't receive facetime calls, you can't download apps, your backups to iCloud won't work, even iWorks and stuff can't save to the cloud.