Are you in Router Mode or Modem Mode ?
In Modem Mode the power light is magenta.
In Router Mode the red power light is an indication of over heating and most not be ignored.
Do not be fobbed off with "if it is cool it will be OK" or "Just blow a fan over it", this is dangerous advice.
When you go out or retire for the night ensure that the Hub is unplugged from the mains.
The only fix is a replacement Hub.
You can either phone in (08:00 is the best time) or wait on here for a few days (6 to 7 days average) until one of the VM Forum Staff comes along.
If you wait on here Do Not bump the thread it will put it further down the VM 'to do list'.
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BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.