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It could be a faulty Telstra TV. You can try manually setting the Display type to match that of your TV. (Settings > Display), You can also try changing refresh settings in Settings > Advanced settings > Display)
If the HDMI and Telstra TV have been replaced, then the only other suggestion that I have is based on personal experience.
A few years ago, the DVD player at my sisters was having issues where you would be watching the TV for a short period of them then screen would go black, despite the TV display working (using the TV remote to change source etc) and the DVD player still spinning happily. I noticed that there was a warm spot on the cable where it had been resting against her TV. I move the cable away from the heat and once it cooled, it was back working well.
I'm not sure if this will help, but it is something worth checking when you notice it happening next.
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