Netflix mode momentarily blinks (black) randomly on 58L9300U

My 4 month old 58L9300U was working fine until a few days ago. Now, whenever I enter the Netflix mode, the display screen momentarily blinks black randomly. The blinking will happen once or twice every second, then not for several seconds. Each blink is very short in duration...maybe 1/30th of a second...but very irritating, making the TV unwatchable.
The blinking begins immediately upon pressing the NETFLIX button...even as the mode starts up, and continues until I exit Netflix. That is, I do not need to be watching a movie. The blinking occurs while selecting a movie to watch and even when I PAUSE the movie.
This problem does not occur during over the air broadcasts. As mentioned, the problem started happening in the Netflix mode after 3 months of no problems.
I have disconnected and reconnected to Netflix using their recommended procedure with no improvement.
Disconnect and Reconnect the Netflix application
Launch the Netflix app.
Using the arrows on your remote, enter the following sequence:Up, Up, Down, Down, Left, Right, Left, Right, Up, Up, Up, Up
Select Deactivate and exit the screen.
Restart the Netflix app and sign in to your account.
Any thoughts as to what is going on? Could it be that my ISP (Comcast) is causing the problem?

I kind of doubt it could be related to the ISP, but I'm honestly not sure what's causing it. You might want to call customer support.
- Peter

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Netflix mode momentarily blinks (black) randomly on 58L9300U

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