Re: HomeHub 5 is the most secure system in the WORLD
Sounds like the router's overloading. I noticed many old routers start giving up the ghost or going berserk when newer security protocols were mandated. I had to retire an old D-Link because it kept resetting. It was my cue to move up to more recent hardware.
I'd have a good long look at it. If it keeps crashing or resetting, it's probably overloaded and it may be time to replace the kit.