Hey mrCROUGH! Sorry to hear that! I'm moving this to the Rainbow Six Siege forums. Can you try these steps, as well as uninstalling and reinstalling? If that doesn't help, please create a ticket with the following information:
Current version of the console operating system.
Digital or Physical copy of the game.
What Edition do you own? (Standard, Advance, Gold etc.)
Does it always happen or just from time to time?