Solid Red light on Hub 3 router

I've noticed the wifi periodically dropping out for a few minutes at a time over the last two weeks and for the last three days the router has shown a solid red light. I tried turning it off to cool down and then resetting the hub like it told me on the website, but it's still solid red. I called Virgin and was basically told everything is fine, don't worry about it. But on here I've read a lot of similar cases where it seems confirmed that it is an issue and should not be ignored. As Virgin were unwilling to accept there's an issue on the phone I'm a bit lost on where to go from here.