Can you please Private Message(PM) me your Username/CID/Service address for the service you need help on so i can pull up your account.
I have checked your NBN-FTTC 50/20 service on our NBN portals, and all tests are passing at this point in time. Speed is also showing 48.35mbps.
Perhaps you may need to investigate internal WIFI environmental issues/factors.
Solid brick homes can be troublesome sometimes, especially if the modem is not in the middle of the house.
You could buy a 20-30m network cable, and move the modem away from the NCD and experiment with modem positions inside your home. The modem does not have to be next to the NCD.
Wireless interference can cause various issues with your WiFi network. If all of your devices connected to via WiFi are affected, then you may need to change some wireless settings. We've created an article that will guide you on How to improve your home network.
This appears to happen with all devices simultaenously within the household regardless of distance from the wifi modem router itself. There is only one device connected to the router via cable and it is not immune to the drop out. Are you able to investigate further to determine the root cause or can you please suggest an alternative way to test/diagnose the issue?