-snip-
Until you rule out the known network issues that have been documented time and time again to be at the very least an important contributing factor
and correctable by your ISP and/or their routing partners---you can't just dump it all on SE's shoulders.
Have you at least tried checking the status of your service provider? Some have their own internal page (like
Telstra), or you can try one of the tracking sites like the downdetector group here in the US. They have a separate site just for Australia as well, called aussieoutages.com:
https://aussieoutages.com/companies
Just glancing at a handful of services/ISP's there seems to be a consistent issue along mostly the southern and eastern borders, but there are also reports coming from the west coast as well. Not talking exactly backwater towns here either---Sidney, Melbourne, Brisbane, Adalaide, to name a few.
-/endsnip-