Zgemma s2 problems with Virgin super hub 2 ac

I didn't change dns or any settings. Just checked all connections and knew myself all was ok and so it was lol . So all sorted after virgin did something and I got decent line lol
 
Hi i have super hub 2ac sky football sky action and thriller is a blank screen in hd this is via a splitter a took it to my nephews same wires and splitter and they all cleared any ideas why in my house it won't clear this is also a wired connection
 
After a big improvement initially, I am getting a lot of glitching again. what I want to know is, when other people are on the internet in my household the glitching goes very bad, I have to bad others from going on ipads or anything for the duration of me watching a match. what does this mean? is my signal not strong enough,?
 
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