Apple TV download speed way too slow
Comcast Cable - Tests well above 6mbps on standard tests (up to 13mbps on speedtest.net). I don't have any other problems with my connections.
Airport Extreme - The only things that are connected to it (at the moment) are the Apple TV, and my MacBook Pro, which isn't even on.
Downloading HD movies used to only take 2 minutes before they were ready to watch. Now, the movies constantly stop part way through, and I have to wait for them to download some more, and sometimes they just stop altogether, and I have to retry the download.
Nothing has changed about my setup since the Apple TV stopped working properly. Could it be my ISP throttling me? I'm not a high bandwidth user by any means: I rarely rent movies, and I don't download anything on bittorent or the likes.
If it's not the ISP, are there any other known solutions to this problem? Please help!
Mac OS X (10.5.7)