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It's possible then that there could be an issue with your connection if he never disconnects without you. At the moment, the best suggestion I can make is that we go through some connection troubleshooting.
You may want to try alternate DNS settings. From the Xbox home screen, go to Settings > Network > Advanced settings > DNS settings > Manual. (If Settings doesn't appear on the home screen, select My Games & Apps, then Settings). From there, enter the Primary DNS as "208.67.222.222" and the Secondary DNS as "208.67.220.220". If that doesn't help, try using the google DNS servers which are: primary alt number 8.8.8.8 - secondary alt number 8.8.4.4.
Also, try clearing the alternate MAC address with these steps:
Go to your Xbox Settings
Go to "Network", then "Advanced Network Settings"
Click on "Alternate MAC Address", and then click "Clear"
Now we have a third teammate and it’s happening to him too. So this is three people getting dashed. From 2 different states. With all different internet. This literally started after the last gameplay update. I’ve check all the internet things they are fine. I don’t know what else to say.