Hub 3 red light and disconnects

I've had a hub3 router for many years and recently it has been showing an orange or red light instead of a constant white light like it used to. The internet has also been intermittently cutting out for a few seconds before reconnecting. This can occur multiple times per day. Rarely, the router will reboot itself.

Following advice, I've tried disconnecting it at the mains etc but that didn't fix it. I'm trying to get a replacement sent but cannot get anywhere with that with VM support. Hoping posting here can help?