Good evening. I am hoping a networking guru can help me out with what is likely a simple problem.

I have just swapped to 2Degrees from MyRepublic UFB and am in the process of configuring the modem. When I set up a WAN, everything seems to go OK, and I get a good connection. Approx 5-10 mins later I start getting DNS errors which I can fix for 5-10 mins with a modem reset. 2Degrees requires PPoE, VLAN 10. What am I missing here? Any help very much appreciated.

(I am entering my username and password, I have just left these out for the pics)

Thanks