I've had the same problems all weekend too, today has been the absolute worst for it though. My Xbox Live connection keeps dropping for 20 seconds- 3 minutes then reconnects automatically, sometimes if I'm in an Xbox Party it doesn't even kick me out of that which is super weird. Its just been a dreadful day off work trying to play anything with my mates. I even upgraded to M350 the other week and got a HUB 3 after having Super Hub 2ac for as long as I can remember and my download speed hasn't gone above 200mbps all day. Shambles.
Yes I am still getting disconnects. My Xbox One just disconnected from Xbox Live in the middle of a match again. I use WiFi on my Xbox but before I upgraded my WiFi to M350 and got a HUB 3 I did not have these problems, but since then they've started for some reason. It's really frustrating paying for better broadband but it ends up being worse 😕
Another thing, I've noticed that when I'm in an Xbox Party thats when my connection begins to drop. I was playing an online game on my own for an hour yesterday and everything was fine, but then I joined my friends Xbox Party and not even 5 minutes later my Xbox Live connection dropped. I don't know if this was a one off but it definitely seems that the only times my Xbox disconnects is when I'm in a Party.
I was having similar problems about 3 or 4 years ago where my Xbox One would disconnect from Xbox Live every 10 minutes and it was impossible to play anything. In the end I had to phone up and open a load of certain ports on the Hub settings, but this time it doesn't disconnect as often or as bad as then.
I've plugged an ethernet cable into the back of my Xbox now and that seems to have fixed the problem. Still I shouldn't have had to pay an extra £21 out of my own money to have the broadband wifi work properly.