Because many people have these symptoms without any peripherals or even anynet hdmi-cec enabled, it could also be a problem in the MU-series software update code. It's possible that the symptoms just are more easy to see and hear when your peripherals suddenly spring into action and somehow make the screen turn on also. I would recommend that if you have fixed time options to choose for software/firmware updates, try those and see if it stops your TV to turn on randomly in the middle of the night. Just remember that "Off" may not be a viable option to fix it.
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It's unbelieveable how Samsung still has these problems. I have 55ES7000 from 2012 and it still turn itself on after 2 hours of inactivity. I don't know if these newer ones have different problem for these symptoms, but for this 2012 model it's a bug in the tv's auto updating section: You can't turn the auto update off! Well you can select "Off" from the menu, but it's just the same thing as "2 hours later". Funniest thing is that when you switch on the TV yourself and go to the auto update menu it shows "Off" when you have selected it like that, but when you hear the TV clicking on all by itself and then press stand by to turn the screen on and go to the firmware auto update menu, it shows "2 hours later" even though you have selected "Off" last time. But if the TV has enough time to complete this auto update check before you turn the screen on then it again shows "Off" even though it could have been on by itself just seconds ago. It works like some trojan agent on the background. We don't have OTA or OTC updates here in Finland, so this problem is frustratingly pointless. This bug has been with all firmware versions since year 2012 to this day. I've made countless reports to local technical support and even had email-conversation with technical staff in their factory. The problem is that they don't understand a thing I'm trying to say. They just ask me to do a factory reset which as many of you know doesn't help. This bug must apply to millions of Samsung TV's and still after all these years these clueless people can't fix this annoying problem. I kind of solved this problem with a remote controlled wall socket after the TV fried my USB drive connected to it with all these unnecessary power ons and offs. Can't find any other way around it, so I'll cut the power entirely from the socket every time I switch off the TV.
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