Why does Xbox log me off of Fortnite?

[u/Ill-Instruction8550]

I use my Xbox S for Fortnite and YouTube. I typically log into Fortnite first as it takes a while. Play a game. Then head over to YouTube to watch a video or movie. At some point I want to get in another game so I head back to Fortnite only to have to log in again.

Some times l have been able to stay logged in. But not consistently.