So what happens is you randomly lose some ammount of your progression. Like you join a server, gain two levels, back out of the game and you're right back where you started. Some people reportedly lost everything. It's allover the Steam forums.
well it seems like a lot of people have played enough to presitge after 5 days, so you'll all have 10th level prestige within 2 months at this rate... assuming treyarch can fix the current problem, and not cause more