When is the server problem going to be fixed?

Well ive been having problems with the halo 4 server, for a few days ago: i cant play some playlists like flood swat etc, i dont get much xp after each match,i was playing team slayer and i went into a rampage and made several challenges and all i got after match (including fast track) was a 1340xp and i dont think that was fair. Anyway, if anyone knows when is this going to be fixed, id like to know. Thanks for your time and have a nice day. Gt: Dr Goku vs Noob