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Help is here @mnguyen55
Do you know what type of NBN technology you have?
Are you mainly using a WiFi or a Wired connection?
Did you notice any changes with the light status of the modem/router when the connection drops out?
If you have an NBN NTD box, did you notice the changes in its light as well?
What troubleshooting have you tried so far?
BasilDV
Send us a PM, @mnguyen55. We'll pull up your account and run some tests.