I've been having exactly the same issue with this unbelievably rubbish tplink archer v2 router that tpg supplied me with when I switched over to nbn. TPG have handballed it to NBN each time I have called (twice), who in turn sent out some "technicians" (pretty sure they were just electricians) who replaced the nbn modem and jiggled some connections. All failed to fix it. After today's failed attempt by nbn to fix it, I decided to get rid of the crappy tpg supplied tplink router and use my old Asus rt-n56u router. It's been up for about 5 hours now without a single dropout, so fingers crossed. Tpg, you really need to do more diagnostics/tests/whatever on your supplied routers when your customers call with problems, before simply handballing it to nbn. Very amateur.
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