Please help me ASAP with was is happening?

So earlier today I was playing halo 4 and suddenly the XP screen post game was not appearing and I was not earning any credits and also when I would press start the XP progression bar in the top right would go down a bit then when I back out and do it again the bar would go down again from the same spot.

Any idea was going on here cause I have had no notice saying that i was banned of any sort from earning credits?

You reached the daily exp cap, it should be reset by now

Yep it turns out I had hit the XP cap,but everything is cool now.
Thanks I thought something was really wrong