Welcome to the Community!
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
Also, we've created an article that will guide you on how to troubleshoot a Slow speed issue. You may check the NBN plan you have as well in order to confirm that you are receiving the correct speed. Check this link: TPG NBN Plan
Feel free to search Community for help with your issue, or contact us and we'd be glad to assist you.