disconnect when playing with 2 xboxes on 1 network

Hello,

I am experiencing a problem when playing halo 5 with 2 xboxes on 1 network.

When I play an arena match, and the other xbox tries to start one aswell, i get kicked from my match. I have no clue why; the game leaves me in the dark with a disconnect error. Playing with one xbox at a time works without any trouble.

At first i thought turning on upnp on in my modem would resolve the issue,but is doesn’t.

Please help, its very frustrating!

My boyfriend and I have been having this issue since last week. We are usually on the same fireteam and one will be disconnected mid match.