Welcome to the Community!
If your service is not affected by an outage or maintenance in the area, then we need to check the type of connection you are using.
If you are using a WiFi connection, then signal interference may be the cause.
We've created some articles that will help you improve your home network. You may refer to these links: Easy Steps to Improve Wi-Fi Connection In Your Home, Wireless Channel on your modem - what is it and why should I change it?
If you are using a Wired connection, did you notice any changes in the light status of the modem/router? Have you tried using a different LAN port or LAN cable?
We tried to search for your account using your community details to no avail. You may send me a PM with your TPG username or customer ID number if the issue persists.