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What troubleshooting have you tried so far?
When you said rebooting, did you notice that the power light is flashing or just stays solid, but the other lights were flashing or turned off?
Shoot me a PM with your TPG account details for us to check on this further.
BasilDV
What's the current firmware of your device?
Also, kindly send us a PM with your account details for us to confirm if there's a fault within the NBN network.
BasilDV