Co -op play

ever since the game drop me and my friend have had a hard time connecting to each other. Seriously is getting to the point where we are even reluctant to play the game at all now. We are extremely big halo fans and are trying to complete our achievements. Theven way we can only connect is if we hard reset both of our xbox 1. Can someone please fix this issue. It would be ashamed for me not to touch this collection for the next three months. Thank you in helping to fix these issues.