If your having problems ranking up with my xp cap when i went to level 30 it wouldent let me rank up until next day. I couldent even rank up in spartan ops, but i was roaming around in my armor in specializations and i noticed that spartan 4 was complete so i went down to wetwork which was next one down out of the eight an it said active so i played a match an it started ranking me up again so maybe u should try this and see if it works for you.