Sounds like a cable connection problem and most likely will require VM action. Nothing major you can do (check that the cable connections are secure and any securing nuts are finger tight, and that's all). If you feel inclined you could connect to the Hub, don't log in, but click on the link "Check router status", and that'll bring you to a page with five tabs. If you copy and paste (as text, ideally formatted) here the contents of the three tabs respectively titled Downstream, Upstream and Network Log then somebody will take a look, and may be able to spot a probable cause. We can't fix it, but if you have an inkling what the underlying problem is, I believe it makes the field technician's job easier.
Suggest you also report this as a problem on VM's text response service 07533051809
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.