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There are different caused of dropouts that you may experience.
In the event that you experience dropouts via Wireless/Wi-Fi connection we did an article that you may find helpful see links below.
We have created this article that can guide you on How to Check for NBN Network Outage
In this particular case, we ran an initial test to the service and it shows a possible line fault causing speed and dropout issues. This has been escalated to our Engineering Team, assessment may take 24-48hrs an updates will be provided via SMS/Phone call or email when it becomes available.
Should you need further assistance, feel free to reply to this message or chat with us at https://www.tpg.com.au/support/contact/ and we'd be glad to assist you.