I have checked your NBN-FTTP 12/1 service in our systems, and all tests are passing.
A 12/1 plan with heavy household usage can appear slow at times because the 1meg upload speed becomes a bottleneck.
For heavy usages, a 50/20 plan will provide much more reliable speeds to heavy usage situations.
Here is a doc to help TS speed issues.
Thank you, David, for your prompt response, but my issue is not with the slow connection it is about the completely dropping off the connection.
The signal mentions connected but without any result for any activities.