Welcome to TPG Community!
We recommend having a read of these community articles, which may help improve your Wi-Fi speed.
Easy Steps to Improve Wi-Fi Connection In Your Home
Wireless Channel on your modem - what is it and why should I change it?
Feel free to drop us a message should you need any assistance. Cheers!
You have to make sure that 5 GHz Wi-Fi is enabled on your modem. Also make sure that you are using the correct 5 GHz Wi-Fi password.
To access the Wi-Fi settings in your modem, refer to the following Community articles as guide: