Mine is superhub 2 but phoned Virgin beginning of week and said it was not working well, told them the wifi was not strong enough. They said no at first but after I asked nicely and said I was a very loyal customer and retentions had said to ask them for exchange they agreed. Superhub 3 arriving Saturday, hoping it will help.
Yesterday my phone was taken back to factory setting but still played up. Today I had another appointment with the Genius team but this time at the Apple Store in Brighton. He did something to phone, something about there being three layers to test, hardwear, softwear and then a third layer which I can't remember what it was. So far it is behaving itself even with the old hub. I really wish I had asked exactly what he had done but it was so busy and it is so hot down here that I just did not take it in. Sorry. Maybe there is an expert here that can understand and explain to you all.
Interestingly when I said shall my husband update his SE he said no, wait for next one !!!!! He did not try and bulls**t me so seemed like I was not the first he had seen. Lovely guy and so helpful.