Hi chris_g1,
Thanks for the info regarding steps for reactivating facetime/imessage. However, this issue is not isolated to a few people, but is happening widely across different devices and platforms (just do a google search to see the amount of discussions). There is some bad bug in how activation is happening from an ios or os x device for facetime/imessage. It is specially true after a repair, or a migration to a new device. Not sure if the higher command is informed of this, but there seems to be no official word on this problem and any fixes that Apple may be working on. Can you report this incident to any higher authority? I, of course would be posting a question at the Mac forum regarding this problem.
Best,
Deep