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Hi @AP,
Have you perhaps tried resetting the NBN box? Send us a private message and we'll have a look at your connection.
-Ahra_G
You might want to look at my post on DNS Denial of Service workaround.
The optical light on the NBN NDT should be flashing green. That's normal. But if any light is flashing red there is an upstream or NDT problem. In that case, OP's problem is at the NBN box so IMHO messing about with the router will not help. OP should try power resetting as suggested and if that fails TPG techs should be able to test from their end.