I have gone back and looked at this again. I do have a new idea now (unless it is just old idea that I've forgotten I tried before).
Are you located near Mandurah (in a tv reception sense)?
We currently have 2 stations called GWN7 defined for Regional WA (excluding Perth & Mandurah), I think I will start with deleting one of those GWN7 stations and get people in regional WA (like cashie) to see if it makes a difference.
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