Another member posted this.
"I have a workaround , not an actual fix. I've been using this because I didn't know deleting and re-downloading would fix the issue. When it pops up and says "update requires restart". Don't click exit. Go to your home screen , quit the game , then restart. Sometimes it takes several tries, but it works for me. Going to try the actual fix tonight though. Can't stand doing the work around over ad over. "
Now I have no clue as to the reliability of this info but has to be worth a try
Also try clearing your cache and relaunching the game to see if this helps. If you happen to be playing on a ps4, please make a backup for your campaign data before doing this.
Im on xbox one and i didn't find a clear cache button lollll is that like uninstalling game n reinstalling it ? And would that mean that my progress starts again ?? (Plzzzz say no loll im lvl 70+ on zombies)
Ohh yeaan iv tried it quite abit already and still no luck atm lolll but illl keep trying, umm and theres a fix ?? (Im a xbox 1 user) and i appreciate all the help