Thanks for raising this with us.
The WiFi connection is prone to signal interference, which may have caused the issues.
We've created some articles that will help you improve your home WiFi network.
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?
In updating the firmware of your modem/router, please send me a PM with your TPG username/customer ID number along with the current firmware of the device.
How do I private message (PM) in the community
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