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Hi @gongwen1997
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 instance, our Engineering team have raised this with NBN Co and requested for an NBN technician to visit the site to fix the fault. An assigned Engineer will be in touch with you via SMS or phone call as soon as an update becomes available.
BasilDV