I'm sorry to hear that the connection dropouts seem to have recurred. Can you confirm the following for us:
Thanks for the additional information, @Amysatchell. I will be refreshing your NBN box which means your connection will drop during the process. After which, we'll monitor your connection for more at least 2 days to see how it goes.
Should the connection drop out again during those times, please refrain from rebooting the NBN box.
I have monitored your connection since Monday and we're detecting dropouts coming from your NBN box. This needs to be checked further by NBNCo. I have escalated this issue to our Engineering Team for assistance. Updates pertaining to this case will be provided to you by one of our Engineers via SMS or phone call.