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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/troubleshooting
In your case, we've escalated the case to our Engineering team due to a possible NBN NTD box issue. An NBN technician will be required to attend the site and replace the faulty device if needed. Your assigned Engineer will be in touch with you via SMS or phone call within 24 to 48 hours once an update becomes available.