Halo 5 Custom Games no longer working

My friends and I play custom games on here for some really great moments and to have fun, but recently after coming back to play custom games again some custom games don’t seem to work anymore. One game mode we play is called jousting and it has worked in the past but now it says “console lost connection to game servers” when it never did it in the past. There is a few more custom games that do this but I was wondering is there a fix or are some custom games just not supported anymore.