The Connection to Xbox Live has been lost.

[(XBOX)Spicy Knigh7]

This error message is driving me insane. I physically can't play the game because of it.
To put it simply, this error displays itself every 40 minutes or so and claims to be a disconnect from Xbox live despite my Xbox live connection remaining strong and steady, I thought that changing from wifi to a wired connection would counter this issue as I believed the issue was the result of a random lag spike on my end which drops the connection, though it never displays the "Network Interrupted" alert, I simply get sent back to the Orbiter with no reason. It even happens at relays, and I know I haven't actually disconnected as I can see people moving around normally in the background. If DE actually cares about their consumers, they should fix this immediately. I have no connection issues on any other game than Warframe and have noticed this issue being posted over and over on the forums. 

DE. Fix this.

[(XBOX)Cyro Titan]

I've been having the same problem, but in literally ever level I load into. I'll play maybe 5 minutes of a mission and then the "You've been disconnected from Xbox Live" shows up. I get put in my orbiter and lose all xp from the mission. I love the game and really want to keep playing but if DE or whoever's fault it is doesn't fix this I won't be a part of the warframe community anymore.

[(XBOX)BAFFLE Prone]

I used to be able to fix this by playing a mission or two with my network type set to Solo, then changing to public. This stopped working tonight sadly and now I’m stuck disconnecting from every game i join with other players after about 20 seconds. Trying a reinstall, then gonna mess with some network options in game and with the Xbox, see if that changes anything. I suppose at this point I’m in the same boat as Cyro Titan. I really do love this game and I don’t want to be forced to quit the game because of something as stupid as this.

[(XBOX)ChrisNumber2]

Ive also been getting a "connection to Xbox Live lost" issue with an open NAT and the proper ports forwarded.  I was able to fix the issue tonight by disabling IPv6 on my router.

Prior to that I was getting kicked out around every 30-40 mins, sometimes more often.  After disabling IPv6 Ive been doing hour long survivals, 20+ wave defense missions, solos, public matchmaking, and matches with friends only.

So if you're having the same issue, give disabling IPv6 a try.  Looks like its working for me.

Hope this helps!