Cannot join Custom Gmaes

I have been having an issue recently. I cannot join any custom games in the customs browser, nor any other one that is not hosted by me. Basically It load to 4/4 but the bar does not load at all and after a while it will put me to unable to join and kick me out of the match. Please help. If nothing works I will have to reinstall Halo 5.

Happens alot. When it does I just don’t play customs that day and wait until the next day. Hope this helps.