I have checked your NBN-FTTN 50/20 service on our systems and tests are passing.
I did notice there is an open ''NBN Incident'' for your service. This means NBN are doing upgrades/repairs/maintenance to their network in your area and may be impacting services.
This is normally a short term thing. This incident is due for completion 22/5.
There is nothing for anyone to do.
If it is not back to normal in a few days, let us know.