Could be the Hub at fault, but repeated resets can also be a symptom of a cable connection problem or power connection problems. A guess on my part, its most likely an issue with the VM cable network, and that's something they'll need to fix. In my view there's no point using the offshore "technical support" because they are useless, particularly if there's any opportunity to blame wifi, so hold on until the VM staff pick this message up.
In the meanwhile, if not already tried check the following - that the Hub 3 power supply is properly connected, all power leads fully pushed home, and if possible try a different wall socket. Also check that the cable between the hub and wall is properly connected at either end and any nuts are fully done up (hand tight), that the cable itself isn't kinked, creased or damaged, and any VM cable on the outside of the building is similarly intact.
Just to explain the point about kinked and damaged cable - if somebody has inadvertently bent the cable too tightly, hit it with something heavy, or abrasively damaged the cable eg with a vacuum or on outside walls a strimmer, the cable can deform, that causes signal interference, and the very high frequencies that cable connections use can be badly affected. I doubt this applies, but it is one of the few things you can check yourself.
