Samsung AutoMotion stuttering issues?
If it was a problem with the TV, it would happen regardless of input.
If you're saying it works fine with DVD and Blu-Ray, but has a problem with a cable connection, it's quite possible that you found the source of your problem.
And it may not be the box's fault - or it may. But some broadcasters speed up the broadcasts slightly due to edits, time compression, or just to plain ol' add another commercial in. That changes the 24/30/60 frames per second movie into something else, which makes it difficult for any television to decode and process without additional artifacting.
DVDs and Blu-Rays don't have that, since they are set at 24/30/60 frames per second, so the varied speed of added or lost frames isn't an issue on those devices.
So with that being explained in a little more detail, it may very well be working as designed - and it sounds like it is.
So what can you do? Well, you can't control how some broadcasts are sent. However, you might adjust your cable box to send a set resolution - such as 720p, 1080i or 1080p and see if channels that have artifacting, have LESS artifacting due to changing those settings. (Most are set to AUTO, which can introduce variables where "some channels have a problem, others don't"). Sometimes if the cable box is doing all the upconversion to 1080p, it may be easier to take a native 720p or 1080i signal and let the TV do the final upconversion to 1080p, and that might lessen the artifacting.
It may be worth trying. Based on your post, I don't think the problem is with the TV.
Just for the sake of completeness, have you tried the "OFF" setting? That doesn't take away your 120Hz, it only turns off additional processing. If not, try that first, and then adjust the cable box's output resolution. You might find a solution that way.
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