Just an update on my situation- i managed to get hold of a working draytek vigor 120 v2 and my connection to the router is now working. The strange thing is i didnt even need to use the pppoa/pppoe trick the vigor is known for as its in pppoe mode only. Seemed very stable, i had 3 days uptime with good sync speeds, low 20ms pings etc so was very happy with that. Only yesterday it started losing the wan ip again, not as often as the hg612 but enough to be annoying. Its in pppoa/pppoe mode today but i'm still having to reboot the modem every 3 hours or so for the modem to re-establish a wan ip. The only change here is we have strong winds and all the cabling is overhead so perhaps that could be causing disconnects? Will have to see if it stops when the wind calms down. Havent bothered to look at logs yet as theres a chance its just the wind.