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My Slingbox Pro has performed beautifully, for years, with my standard definition Directv DVR. I just upgraded to a HD tv and purchased a Directv HD DVR. I attached the required HD connection component to the Slingbox as well. But now, when viewing, either on my pc or on my iphone, I get a virtually unwatchable picture. The picture is frozen most of the time and when it works, the sound constantly cuts in and out. Also, if I try changing the channel, it takes about a minute for it to happen. At first, I thought my 6mb DSL connection might be too slow for HD. But just yesterday, AT&T upgraded my connection to 12mb but the situation has not improved. Any help would be greatly appreciated!