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-fttn/problems_connect_internet_nbn_fttn
In your case, we've escalated this to our Engineering team as we've detected a possible fault within the NBN network. An assigned Engineer will be in touch with your via SMS or phone call within 24 to 48 hours once an update becomes available.