As anyone managed to get a descent router for the HUB 3 most shocking piece of rubbish available, always dropping wifi every other day the green radar on the modem keeps flashing having to reboot it as least 3 times a weeks. Guess what you ring them up and they tell you theres no problems and they work ok... Sorry they are useless that's the HUB3 and also the so called techs reading from a PC screen.
Hub 3 has been faultless for me and I have had it for years!!!
If your wifi is still working, you can ignore the flashing green wifi symbol, as its a bug in the firmware causing it to flash (if it hasn't already been rectified in an update - can't say I've seen my icon flash in the past year!).