My 3ds xl constantly disconnects online and has since i have been with virgin, but as i dont use it much i had decided it wasn't an issue and was willing to put up with it, but now my xbox has recently started to do it too.
So i have tried a day with it being wired, and a day with it wireless and i still get the same thing disconnects on my xbox every few mins, for 1 second, which boots me out of my games online, and my chats and stops any videos i have been playing, seeing as how the only reason i am currently with virgin media at the moment is because of the internet speeds for my gaming,I'd like this to be resolved asap or i'll be looking to switch to a different ISP. especially since i think it's also ridiculous that my bill had raised twice within a 5-6 month period last year too.
Seems lately this is a new issue that has come up, myself and others are having this problem. I can't garantee it will work full time but may just be a temp solution, but try setting up a guest network and connecting your xbox to that. I tried it last night and it did stay stable.
Hopefully it'll help you until someone from VM gets back to you.
Just to clarify the fault reference I have provided to fleaboobash is specific to their connection. There is a slow speed issue in the area their connection is on. It is not connected to the Xbox live Superhub 2 AC issue.