I just had the same issue today. I was on the verge of writing Samsung off completely. I bought my TV (UN75MU8000) 2 years ago and right off the bat I had issues with the SmartHub and they came and replaced the whole TV. Today I had the issue with it flickering off and on nonstop. I tried disconnecting it for long periods of time, disconnecting my router, disconnecting all HDMI connections from the SmartHub, to no avail. Then, I read something about issues with other controllers that are used to control the TV (DirectTV and Firestick in my case). I started taking the batteries out of all the remotes one at a time, and once I got to my Firestick remote, I noticed the red sensor light on the TV stopped flickering. Easy fix! Check everything!
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