Welcome to the community!
I would love to help and see what causes dropouts on your NBN service. I tried to use your community details to pull up the account, however I got multiple result. Kindly PM me your account details (Username/Customer ID or Contact number associated with the account) and I'll run a test on your connection.
Thanks for sending me your details.
I ran initial tests on your service and it shows connected for 1h 47m and no line fault was detected.
I'll keep an eye with your service and in case you will experience any dropouts or any difficulties.
Do not hesitate to notify me or post an update on this thread.