Before attempting the troubleshooting steps, we recommend that you do the following below.
Check our Service Status at https://www.tpg.com.au/servicestatus
"Power cycle" your ADSL modem. This means turning your modem off and waiting for one minute before turning it back on again. This allows your modem to reestablish connection to our server.
If you are still unable to connect to the Internet, you can proceed with the troubleshooting steps indicated on this link: https://www.tpg.com.au/support/problems_connect_internet.php
In your case, your service seems stable and working within specification.
Feel free to search Community for help with your issue, or contact us and we'd be glad to assist you.