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ISP :

I have a new Archer VR1600V (from TPG), the 5g wifi signal is being received on my devices but when I try to connect I get an error message "no internet connection", if I reset the modem (power down/up) the 5 g signal works on my devices for a short time then fails again. There is no issue with the 2.4 signal as too with an ethernet connection, only the 5g fails.

Can you assist