Fingers crossed, I seem to have fixed my own similar problem. I was getting pretty hot under the collar but both NBN and TPG claimed the problem was not on their side. My NBN kept dropping out no matter how I fiddled with the cables and resetting etc. In desperation I took out the co-axial cable connecting the ARRIS unit to the wall plug and put a slight kink in the tips of the centre copper connector both ends, to ensure that when it is screwed in there will be a tension on the tip to touch the inside of the female/receptor hole - to ensure positive contact is made. I also sandpapered the copper wire to ensure it has no coating preventing clean contact. So far it seems to have done the job! Green lights all over!
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