I have a V6 box downstairs connected to the hub and a TiVo box upstairs connected via a home plug.
I always used to steam programmes between each box fine and over the last 3 months every time I stream a programme upstairs that was recorded on my V6 box it keeps stuttering constantly making it impossible to watch.
I have spoken to the technical team who were not helpful at all and said I have too many devices connected to the WiFi and I should disconnect them before watching a programme. Which I am not prepared to do! Nothing has changed in or house we have vivid 200 broadband and have the same number of devices. It worked for a year just fine.