I've managed to run remote test and it shows no evident line fault that can be service
For customers experiencing any issues with their NBN service, we recommend the best thing to do first is check if there's an outage on the NBN network.
We have created this article that can guide you on How to Check for NBN Network Outage -
I would recommend having a read on these Community articles related to your issue:
Troubleshooting a Slow Internet Connection
Easy Steps to Improve Wi-Fi Connection In Your Home
Should you need further assistance, feel free to search community for help or chat with us
at https://www.tpg.com.au/support/contact/ and we'd be glad to assist you.
Your modem is currently detecting a sync speed of 48Mbps from the line which you can confirm when you log in to your modem's user interface. It appears that the problem is getting the result to show up on your devices.
It's possible that the trouble you may be having could be WIFI-related (signal interference, distance, weak signal) if you're using a WIFI connection only.
We can try and have our Technical team to assist you in checking the wireless connectivity and if it can still be improved.
May I know the best time to organise a call back for you?