I have recently upgraded from a hub 3 M200 to the new hub 4 1Gb service.Now my smart TV keeps dropping the wifi connection in Sky TV. I then have to reset and re-enter the password. This happens several times per day.
At the best of times Wi-Fi is a fickle beast that can be affected by numerous things such as distance from the Hub, building construction, other electronic devices, neighbouring Wi-Fi, basically all sorts.
Can you try an ethernet cable from Hub to TV Box ?