Turn it off for 30-60 minutes then back on again and see if it still does it.
***** If you think my answer has helped - please provide me with a Kudos rating and mark as Helpful Answer!! I do not work for Virgin Media - all opinions expressed are of my own and all answers are provided from my own and past experiences. Office 365, Dynamics CRM and Cloud Computing Jedi
The Hub 3 has (in my experience) usually felt warm to touch, but a red light indicates overheating. Recent reports in the forum imply that there has been a bad batch of hubs that are overly sensitive and indicate overheating when they are not, but whether that applies or not you need a new hub.
I'd try and phone in, but chances of getting through are small, and smaller still for a sentient English speaking humanoid. You can text it in, or wait for the forum staff to pick this up and deal with it (that last one is my personal choice).
In the meanwhile, you might choose to leave it turned off - that's the sensible option. Personally I'd make sure that the hub is turned off overnight and if I'm out of the house, but otherwise continue to use it (I'm reckless like that). If you're used to leaving it on 24/7, then remember that it takes 10 minutes to get its act together after being turned on.
I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more
Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks