Welcome to the Community @pseudonym
For customers experiencing any issues with their NBN service, we recommend the best thing to do first is check if there's an outage on the NBN network.
We have created this article that can guide you on How to Check for NBN Network Outage
If there are no known outages in your area, customers can proceed with the troubleshooting steps indicated on this link : https://www.tpg.com.au/support/nbn/problems_connect_internet_nbn
We were able to locate your account using your community details and the internet connection has been restored. The modem has been stable for almost 3 days and counting.
Let us know if you need further assistance.