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Hi @Acher ,
We created an article on how to improve the wireless connection at home, this may help eliminate the dropouts you experience using the Google Nest, please see the link below.
Easy Steps to Improve Wi-Fi Connection In Your Home.
We do not recommend specific make and model of a modem but any VDSL2+ modem will work with TPG FTTB however VoIP feature will only work using our supplied modem.
Regards,
Let us know how it will go.