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I need uPnP for my media streamer, as it gives me by far the best sound, and, until recently, this worked fine with my Arcadyan in the study and the hifi in the living room, ethernet connected through Netgear AV500 Powerline adapters. I thought I'd upgrade these to the much higher performing TP-Link AV2000, for enhanced streaming of movies. Unfortunately, I have ended up in the same situation as you and many others, with the Arcadyan rebooting every 10 minutes or so, the streaming software hanging on my PC and SBS On-demand stopping. The Arcadyan log indicated that it was having major problems and losing connections. After days of trying various options, I went back to the old Netgear powerline adapters and everything is working fine again, with uPnP enabled. I doubt there is anything wrong with the brand new TP-Link AV2000 adapters and strongly suspect a shortcoming with the Arcadyan firmware. Not holding my breath for Telstra to address this and, in the meantime, will continue with the older Netgear technology.
If you have the Smart Modem Gen 2 [Technicolor DJA0231] then it might be time to get it back out of the box and have another attempt.
Something has changed because devices are not dropping anymore. I have a cheap range extender that would always drop out but even that is connecting and staying connected! I also have a new mobile phone and that doesn't drop either. I am no longer using any static IP settings on devices. The only modem config changes I have now is - Band Steering' set to OFF and Lease time set to 500h.
I can't tell if there has been a firmware fix applied recently but it finally seems to be working properly. Happy days!
There has been a configuration file update which fixes the DHCP issue on DJA0231 modems connect to a cable connection, The configuration file gets updated when modem is rebooted. That is why devices connected to your modem are no longer loosing there connection.