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I have reported the bug before in an other thread but it's not yet fixed in the latest update v3395.
Watch the video below to see that the picture mode setting is not permanend after standby.
The bug is 100% reproducable but you have to left the TV in standby for more than 4 hours.
In other words every morning I have to set the picture mode to my preferance.
THE BUG IS ONLY FOR THE FIRST OPENING AFTER NIGHT STANDBY
Following steps will resolve (I hope) the picture mode bug.
In Network Settings, enable Remote start and under Network/Home network enable IP Control. For me this picture bug has gone. I hope this is the solution for this bug.