I started experiencing this problem around the same time this has posted. I am in San Antonio, TX with a Roku 2 XD hardwired to a Buffalo router connected by ethernet to the cable router in the other room. Only Netflix causes me issues., which is a problem since it makes up the majority of our viewing. There is a time component (almost always in the evenings between 7-10 PM central) and Netflix on Roku is virtually unwatchable on Saturday evenings, now. Two dots, if we're lucky, but it's getting worse where it will drop to a single dot and then sit there. It seems to be a Roku issue, and nothing to do with anything I can change on my end.
DNS has been changed and everything is optimized. This is not a Netflix problem. Netflix works great from every PC and Macbook I have in the house, even over wifi, except on the Roku. It's not a bandwidth problem. The good news is my network is screaming fast, and I can pull 8+ Mbps from anywhere in the lower 48, on average, even on Saturday nights, and a solid 6 Mbps average from Anchorage, AK (FWIW). IAll of the other Roku channels work without issue, even when Netflix on the Roku is. I'm 99.9999999 convinced this has nothing to do with me.
It's time to turn the tables. I think the Roku Netflix service is overloaded. Can anyone prove me wrong? I love the Roku, and am a promoter to my friends, coworkers, and family. But should this good thing come to an end? Who can I go to at Roku to do more advanced troubleshooting, from their end?
I've been having these same issues and symptoms for the past couple of months -- worse lately. I'm in the Kansas City, MO area.
I have an original Roku N1000, with excellent wireless signal to an Asus RT-N66U, and 18M Uverse service. Speedtest.net results have always been good. Amazon Instant Video has been good. Netflix is nearing unwatchable in the evenings/nights. It's even been problematic during the day recently.
Before I moved a month ago, I was also having issues. I was wired between Roku and router, but still had 18M Uverse, and still had speed & quality issues with Netflix.
Lately, I can't maintain more than 0.7M - 1.1M network speed. It will sometime start faster, but then drop after a few minutes. Switching to Amazon Instant Video at the same time will have 4.2M - 5.6M speeds and _not_ drop quality during. Before getting Amazon Instant Video, I thought it was my ISP and their initial "speed boost". I don't think that's it, now, though.
I've tried changing DNS, rebooting the Roku...no improvement. Netflix _really_ needs to develop some tools or provide IPs for traceroutes so that these issues can be diagnosed and resolved.
Roku and/or Netflix need to get a handle on this issue.