What an odd issue! This is the first I've heard of something like this, so I've 'phoned a friend' to get some outside advice. In the meantime it would be worth it to check and see if your TV needs a firmware update. Also, have you tried seeing what happens if you open up a video and then pause it? I'm also interested in knowing what happens if you were to unplug the TV from the internet and try to watch a video from a DVD player or other offline media. Be sure that you also 'forget' the Wi-Fi network in your network settings since it may automatically re-connect itself to the net, the same for your Dish receiver, just temporarily.
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