Hello all. I've been having this problem for weeks and last week an engineer came to install a new SH3. It worked fine for an hour after he left and then it became unstable and has been ever since. The flashing green base light and internet light do not seem to go away even when I connected it directly to the splitter which usually works.
I feel as if this issue is to do with Virgin itself and that they've taken the signal away. In the period of this billing month so far I've had not internet for at least 10 days by now and I don't know how to request an engineer as I am not able to currently call customer service. After all this they give me peanuts as compensation before the engineer last week and have not compensated me for the whole period of no internet connection despite everything I've done to fix it.
Well apart from saying that your Hub 3.0 has no signal (indicated by the flashing green lights) there is not so much I can do to help you. The Forum Team will get to your post in time and will be able to help you.
Also note I do not work for Virgin Media (in fact I only know of 1 SuperUser that does). I am just a customer like yourself.
200Mb(SH2 SH2AC Hub 3.0), 2 X V6 TV XL, Phone M. 100Mb Business (Hitron Hub).