im wondering how i have been demoted in mulitplayer because last night i got to 30 before heading off to bed and then the next day i checked my profile and i was apparently 28 for some reason. was because i leveled top quickly in the double exp? but i was playing with a friend at the same time and we both headed off at the same time as well and he has kept rank whereas i have been put down a few, any ideas will be appreciated?

I had it happen to me as well. I only went down one level so no big deal. I think mine happened because my last match before logging took straight back to the main multiplayer screen.