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You could buy it some flowers, after all, Valentine's day is in a couple of days.
What colour are the DSL/WAN and Mobile Signal lights? What type of NBN connection do you have?
You can also go to https://fix.telstra.com and run through the troubleshooting steps.
My modem is blue how do I fix it
@Mattfoster92_ First thing that comes to mind is to reboot the modem and see if it picks up its normal connection again (I'd be inclined to turn it off for about 5-10 minutes then back on)
Apart from that, call NBN Tech Support on 1800 834 273 or ADSL 13 22 03