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Its most probably due to the fact that NBN who now own the copper and HFC street cabling are reaching the critical stages... and causing degradation.
You could run theTelstra troubleshooting tool to eliminate Telstra and internal issues
A "Like" is always appreciated. If my advice is a solution, please mark it. I'm not a Telstra employee. 50 + years exp. in radio comms., eg mobile phones since 1963, two-way radios, base stations, antennas & pagers. One of my mottos: "Believe in yourself, and you can accomplish anything".