Hi Jack!
Which system are you playing Black Ops 2 on? If possible, have you tried playing your disc on a friend's console to see if it happens on their system as well?
Also, when exactly do you get a freeze on Raid? Is it when the map has been selected and everyone's being loaded into the match?
^LM
If you need more help, hit us up on Twitter: https://twitter.com/ATVIAssist or on Facebook: https://www.facebook.com/ActivisionAssist.