At lower quality bit streams the picture could
be described as grainy. With "adaptive streams" being used for Netflix, the Roku will start displaying a Netflix title at the lowest quality stream but, if throughput to the CDNs that Netflix uses for the Roku 2 boxes is good enough, the Roku should step up to a higher quality stream within 10 to 30 seconds.
Having poor throughput (either between the Roku and the ISP, or between the Roku and the CDNs, and between the Roku and the content servers for the other channels) would explain the "graininess" for Netflix and rebufferings for some of the other channels.
Let's start at a more basic description of your Internet service:
What country are you in? Did that part of your country have a serious storm in the past couple of months that would cause the Internet Service Providers and Internet backbone to undergo repairs at this time?
What is the name of your Internet Service Provider?
What type of Internet service is this? (E.g., Broadband (cable), Fiber to the house, wireless service, ... dial-up modem)
If you run Speedtest (http://speedtest.net
) on your PC just after having issues with the Roku, what does Speedtest report as the "Download speed"?
If you are willing to install the (free) "Speed Test" channel on your Roku, when you run the Speed Test channel on your Roku, what does it report as your download speed, say, on the last (largest) file it attempts to download to the Roku?
I have to leave for a while, but maybe someone else can pick up on my suspicions and run with them if you post your answers before I get back later tonight. My suspicions (pending answers to above questions) are:
- ISP throttling (a few are well-known for this: they allow very good throughputs until you have viewed a couple of movies, and then they radically reduce your throughput)
- Maybe a different DNS set in the router (especially as the first DNS IP address in the router), but choice may depend on country.
- Possibly a different wireless channel to select one that doesn't have as much interference (try highest number channel, lowest number channel, channel right in the middle) Note: this will not affect Ethernet cable connected Roku boxes.
I could be all wrong (again), but we might as well work on eliminating some of the other (non-power) possibilities.