Those who've played new Call of Duty games in the past several years are no doubt familiar with the "Update requires restart" notices you'll frequently get whenever the franchise's client goes through a patch. As the popup says, you have to completely close and restart the game every time this happens.
It's a major annoyance that players have had to contend with for ages now, regardless of whether they're playing on Xbox, PC, or PS5. It's particularly irksome when Call of Duty gets several updates in a short amount of time, and players have reported getting stuck in loops where they're continuously forced to restart the game over and over before as well.