So I was farming for event mission completion this morning, and suddenly the game forced me out of the game, went into Gmail, and I got this.

Thinking that it might be something that might go away for several hours, I didn't touch FGO.

Then I played it at 6, and the SAME THING HAPPENED.

Turns out it's a bug due to the versions. I've heard of this, but it never came to my attention, so goddamn me.