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
In your instance, we've raised this with NBN Co for further investigation as there's a possible fault within the NBN NTD or Network. Your assigned Engineer is monitoring the case and be in touch with you via SMS or phone call once an update becomes available.