I play on Xbox and when I play as killer, there’s are chance that it will just randomly end. I get the quitter bonus for all remaining survivors and am sent to the endgame screen. Just happened to me and I depipped cause of it.
What're the chances that your internet is cutting out or having a spike for even a second? Idk any issues for consoles, but I used to have the same issue as you on PC and it was invariably caused by me having a random ping spike that was enough to drop me from the game but keep my points and give me bonus points from the survivors.
I had this issue before dedicated servers, which is why I think you have the same issue.
You're the host on XBOX. Might want to test your internet.