Woke up this morning to no Internet.
Checked the modem and then NBN Box. Modem seemed ok so pulled power cable on NBN Box to reset it. Replaced power cable of NBN box and now BLUE light's on but RED light is flashing and there's a regular, every two seconds or so, click-click coming from it.
Have checked the outage page of NBN for my address and there are to recorded outages in my area or address.
My NBN service has been rock solid since it was installed in 2018.
Waiting of TPG NBN tech to call but is there an easy fix I can do myself to avoid the need of tech advise.