Subscribers to participating cable and satellite providers can watch the latest episodes of over a dozen of FOX's TV series on the FOX NOW Roku channel. Currently (July 2013) participating are AT&T Uverse, dish, Mediacom, and Verizon FiOS. All Roku users can watch promo videos, behind-the-scenes interviews, and clips, and other select content. Make sure your Internet provider is on the list.
There are a few things you can check. Mostly it is about how much demand you are using versus the service, and hardware you use, to provide it within your home.
The service level (bandwidth) is what you have purchased. This is a maximum and can go down considerably depending on time of day and who your provider is.
Do you have other users putting demand on your internet service - this may include neighbours who could be using your wireless internet if you do not have security turned on (ie password protected). Also if you have a lot of users, your wireless router may need to be upgraded to cope with the demand properly.
Is your tv wireless? This requires a good signal - if your router is far away within the house or buried behind heavy materials it may not be able to provide a 'fast enough' connection to your tv to stream your videos.
Netflix has 3 quality settings you can choose - if you have a lower internet service, the highest quality MAY be too much, especially if there are other users at the same time. Usually a 5 or 6 meg service can be at threshold for the highest quality setting depending on the 'actual' speed of your service at a given time.
To keep yourself happy while you resolve this, choose a lower quality setting on netflix - this should allow you to watch without it buffering all the time.
So what has changed since you got your tv? If the setup is all the same, then maybe you have more users. Check your security on your router. Has anything been moved? If so there is opportunity for cables to have been damages (or bad connectors) and also signal loss.
If you have a slower service, perhaps demand in your area at certain times is lowering your service enough to caused buffering issues.
Livestream, formerly known as Mogulus,
is a live streaming video platform that allows users to view and
broadcast video content using a camera and a computer through the
internet. It offers a free ad-supported service and multi-tiered premium
Livestream also offers wireless HD broadcasting in the form of a
device combination called Livepack, described as "a satellite television
truck in a backpack."
In September 2009, Livestream started providing custom channel pages to stream events like concerts from Kina Grannis, Pixie Lott, Eric Gales, David Gray, and Foo Fighters. These pages integrated live chat, Twitter, and Facebook.
Livestream has been used to stream content by Gannett Newspapers and by
the World Economic Forum, and some local TV affiliates, usually for
local news and storm watch.