This is an Apple problem, plain and simple. I've quit using the ATV2 now for Netflix as it constantly stops and starts during movies and more than a few times has told me it cannot connect to the Netflix servers when every other Netflix device in the house had no problem at exactly the same time. This has been ongoing for MONTHS now.
I have Netflix on my Smart LG TV, my PS3, my iPad and my Panasonic BluRay player. NONE of them has these issues with Netflix on the same network, same router, same 25Mbps download connection (tested any time of day at 24Mbps solid) and all using the default DNS from my internet provider (Telus). All devices are hard wired ethernet with the exception of the iPad and the Panasonic player which are both wireless N and no issues.
I (and thousands of others) went through this same nonsense over a year ago with iTunes movie rentals on the ATV2 that would constantly stop and buffer and as I suspected then and stated so on these forums, it was finally and quietly fixed by Apple after all their denials for months.
Having said all this, chances are good I'll be an easy sucker bet for the new ATV3 expected to be announced tomorrow and ONE MORE TIME hoping that everything is fixed and working on the new device. Sigh....