Unlock notification causes game to freeze?

I’ve got an unlock notification that pops up every time I return to the menu that I can’t get rid of (it says I’ve unlocked a video but I can’t see it in the extras menu and all videos just take you to the Halo channel).

Every time it pops up the menu freezes and if I’m in a lobby (customs or matchmaking) I get booted. At first I thought it was just a problem with the menu but the fact that not everyone else is screaming about it leads me to believe that it’s the notifications that’s causing it.

Anyone else having this issue?