Have 75" 6 series..5 days old. Just started doing this last night and this morning. Difference is I don't have anything attached to ARC HDMI channel..only have HDMI in channel 1 from my wireless HDMI box. I would say anecdotally so far the turning on has suspiciously corresponded with me returning to the house almost exactly... didn't happen randomly over night. This leads me down a different theory that it's associated with my mobile device connecting with the network and triggering something on TV since it's in same network. I am turning off anynet+ for a few days and see what happens.
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