I had an ethernet cable connected as well until a Samsung remote app called myTifi started offering the ability to turn the TV on thru the network if connected wirelessly. I never had a problem streaming video wired or wireless, but the Xfinity Sampler app would not play conistently without freezes and breakups. I tested my network options and discovered the speed differences. The Xfinity app just sucks a little less than the Vudu app.You have to be kidding me.... this TV doesn't have gigabit ethernet? That is stupid. I have wireless drop out issues with this TV when I first got it so I ran an ethernet and haven't had issues since. While I have zero issues buffering I just wanted to check the speed the TV gets and this is how my "issue" developed. Tomorrow morning when the Wife is sleeping I'll tinker around with WIFI and see the speed differences.