I have no idea what you’ve done in the last few days but players who have never been disconnected before are having issues. I was disconnected in a key moment last night and it wouldn’t connect back to Gears services until I rebooted the game (PC). My friend just had the same issue (XBOX One X) where in a key moment it did the exact same thing.
I’ve never been disconnected, ever, in Gears 4 or 5. But all of a sudden somethings going on and I’m not the only one.