From time to time (not frequently) the normal blue light on my BT router changes to a flashing red one and sometimes an alarm sounds, of course I close it down and leave it a couple of hours or so then normal service is restored.
The question is what is the worst that could happen and is there a way to prevent it?
Global thermonuclear war.
Is just your router failing to obtain a connection. Leave and it will keep trying and hopefully go blue again
That's the meaning of the flashing red light on a BT hub, definitely.
I wouldn’t turn it off - routers ‘train’ which means they try and tune themselves to line quality, but if you turn them off they can forget the optimum settings and the exchange also thinks the line can’t be good, which can cause a lower speed connection.