Why can't I play Arena Slayer????

For the past few months I have been unable to play any Arena Slayer matches. I just constantly get the “UNABLE TO MATCH - not enough players to support a game” message.
I try during all different times of the day, and the result is the same. I have tried different search preferences - Expanded and Balanced, even Focused, and still the result is the same.
I even checked if I had a ban, and I don’t.

The thing is, it’s only the Slayer matches that I’m having this problem with. I can play Team Arena, FFA, BTB, and Warzone with no problem.

Also, my son, who’s Spartan rank is just a few below my own, uses the same Xbox One, under his own profile, and he can player Slayer matches practically at will.

try to sign off and sign in your profile and close completly halo 5.

Tried your suggestion, and so far no improvements. Perhaps it will be better tomorrow.