Additional Network Ports for Multiplayer Gaming: Why does my Xbox one s keep disconnecting ...

have you got your profile on any other form of Xbox I'd you do delete it straight away and then it will stop because no one will be able to sign in on it

Additional Network Ports for Multiplayer Gaming: Why
The service alert now is over so just head to your game and start playing

Did you try changing your NAT type? The helpdoc says:

Open:

With an OPEN NAT type, you’re able to chat with other people, as well as

join and host multiplayer games with people who have any NAT type on

their network

Moderate:
With a MODERATE NAT type, you’re able to chat and play multiplayer games

with some people; however, you might not be able to hear or play with

others, and normally you won’t be chosen as the host of a match.

Strict:

With a STRICT NAT type, you’re only able to chat and play multiplayer

games with people who have an OPEN NAT type. You can’t be chosen as the

host of a match.

-- So I take that to mean if you have STRICT NAT, and if anyone in the group DOES NOT have an OPEN NAT type you are going to have problems.

Are you both running STRICT NAT type?

Sorry to hear it. If the ability to boot someone is an in game feature allowed from team killing then you'll need to contact the devs to get more assistance as Xbox does not deal with in game issues. My suggestion to you would be to start by posting to
the games specific forums.

Check this link for a possible solution:
https://support.xbox.com/en-IE/xbox-one/networking/random-disconnect-solution