Though Messages has its quirks, I've been lucky to avoid most of them ?*I haven't had my message history disappear, nor have random contacts popped in or vanished out of thin air. I've rarely had problems with messages not being received or erroring out.
But I'm not immune to every iMessage problem. And the current bane of my existence is group messages ?*and the multiple threads they spawn in their wake.
Full story from the iMore Blog...