OK well firstly it is almost certainly the case that the red light has absolutely nothing to do with any WiFi issues. It's normal to (mis) associate one issue with another. Tell me, did you have any issues, any issues at all, BEFORE, you noticed the red light?
It's a bit like the often cited scammer issue of someone calling you up randomly and claiming that they are from <insert provider here> and claiming that they have detected some connectivity problem and have you also seen this? Now tell me, who hasn't ever, ever, experienced some sort of issue, so you see how their spiel is somewhat believable?
Anyhow, the red light is a symptom of the hub's processor overheating, now it probably isn't and it is more likely that the 1p component that VM used in their hubs is failing and showing red when there isn't actually an issue. Whatever the reason, it does need to be replaced on the grounds that if it were to overheat dangerously in the future, to the point that you house burns down, how would you know?
There does seem to be an uptick in reported cases of this - this isn't actually too surprising, you can imagine a situation where a bunch of Hub 3s were manufactured with some components of dubious quality or providence and so will likely start to fail at the same time. Of course whoever signed off on these components will, no doubt have long since left VM probably with a massive payout for 'saving the company money' - cynic? Me? Absolutely not!
