@yafei253699 I'm sorry to read about your NBN HFC connection that is unstable. Our technical team is coordinating with NBN in order to provide a solution. I would suggest you ask about the downtime and adjustment with them after the issue is fixed. Our Technical Escalations team are working to have this resolved asap. They will contact you directly to provide the latest info.
As mentioned previously, our Engineering Team has already raised this case to NBNCo. The last update from NBNCo was posted yesterday advising us that there's an NBN Network fault affecting your connection. There's no provided Estimated Time of Restoration (ETR) yet, but as soon as we know more, the assigned Engineer to your case will contact you about it.
I can only imagine how frustrating this entire ordeal is for you, but bear with us further while we work this out with NBNCo.
Based on the log on file this issue has been raised to NBN Co. and we're still awaiting for their feedback. Updates will be provided when it's available.
Our Engineers tried to contact you earlier today using the contact number on file unfortunately no avail. Please confirm your best contact number and preferred time.