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 have identified an issue with the line causing the no connectivity and dropouts. We may need to send an NBN technician to further look into this and you'll receive further updates via SMS or phone call.