It doesn't sound like Comcast is working on this and all of the possible solutions from them don't work for anyone. Others on this thread said a 4k box works.
I went ahead and called Comcast and asked for a 4k box to replace my existing box. I was surprised that they did it without asking any questions. The support person even managed to ship it for free and it got here in one day. At first he said he would have to charge $15.
The new 4k box works great with no stutter. I tested a couple of Netflix shows I had problems with before. As mentioned before, apps also seem to load quicker. One note, as others have mentioned... the 4k box works fine with my non-4k HD TV.
Save yourself some time and frustration and order a 4k box. Keep in mind that all of your scheduled recordings and saved recordings will all be there since it syncs from the cloud. You will just need to configure your remote to work with your TV/audio system if you did that before.
Oh yeah, there is one thing that is different with the 4k box. It does not have an optical audio output jack on the back of it. Before, I had the comcast box auido optical output going to my audio receiver. Now, I use the optical output on my TV and it works fine.
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