Disconnected From Local Network

Bought Halo 5 last week, have barely been able to play at all. I search for a game it gets to step 4/4 after finding all players then it says i get disconnected from local network. Anyway to fix this? One night out of 6-7 nights i have been able to play. I’ve done port forwarding and other things. Set my NAT type from stirict to moderate to open back to strict and back to open. I’ve used my wired connection and my wireless connection still nothing. I can play other games be in party chat with friends but no halo… If i would have known i couldn’t play it i would have never bought it. Any help is appreciated.