The modem/router I was provided with is a Huawei HG659.
It's signal strength is not sufficent to transmit wifi through the small apartment.
The maximum distance is about 25 metres.
Is there another modem supplied by TPG which has a higher signal strength, or is there a modem/router which can be bought indpendently which will maximise signal over a longer distance.
Welcome to the Community!
There's some great tips on this topic here at our TPG Community on Easy Steps to Improve Wi-Fi Connection In Your Home.
Please check it out and let me know if issue persists so that I can sort out the next steps in resolving this issue for you