First background: An all in one TP-Link modem\router works fine. I have a master filter installed.
After my previous RTA1320 started behaving oddly, I found another one on trademe. It was sold as new\unused and indeed it looks in pristine condition so I don't think there's anything wrong with it. TBH I took the old one apart and couldn't see anything wrong with it (no bulging capacitors, etc) But the new is exhibiting the exact same issues as the previous one when setup in half-bridge with a gargoyle router. Essentially:
1) I cannot load certain websites at all (vodafone.co.nz, amazon.com) while others will load
2) If I do a speedtest and select vodafone as the server, the ping seems good, but then it fails to initiate the data download completely.
3) If I select one of the other servers for the speedtest it seems to work ok
And this all happens if I plug directly into the modem, taking the gargoyle router out of the picture.
I seem to remember somewhere reading that certain modem\DSLAM(??) combinations cause issues, is this a possibility?