same issue here. bought the atv around day 3. been using it to watch netflix everyday just about. 2-3 days ago, started having issues.
when selecting netfix in the menu on atv, it acts like it forgot my netflox login info. so ive had to put that in over and over - and it never sticks. it says it cannot connect to the netflix server - specifically:
"Sorry we could not configure your device. Please try again later. If the problem persists, please visit the netflix website. (114:500)
Click OK on that, then I get the "Accessing Netflix" spinning wheel for about a minute. Then the "enter your netflix email ID form pops up. Again, as if it forgot I have been logged in and watching shows for weeks now.
Works fine on my mac, iphone and ipad. This has to be atv/netflix issue.