What type of NBN connection do you have? (What type of NBN box?)
When you have a dropout, what happens to the lights on the NBN box and wifi router?
Does it affect ethernet devices and/or wifi devices?
Hi Simon. If the DSL light on router is lit during normal operation and goes off or flashes when internet drops, indicates a problem maybe with copper wiring or in NBN network. Job for a moderator.
Regarding the wifi, when you have a problem with it, can you check if the signal strength at the router is the same. If router is faulty, the wifi might drop out from time to time.
Otherwise, it might be interference. Here are some articles.
SimonT, David.... I have found from research and experience, that modem problems cannot be ruled out, even when the DSL light is on. Your best bet is to keep persisting until a TPG technician is sent out. He/she will test your phone line and if the UL/DL speeds are good, the problem is likely your modem. Of course, you can have a good day with your copper, but my experience with NBN is that they will not bother until you/TPG say you both have ruled out modem, internal cabling and ISP issues.