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Constellation

QN55Q7FAMF turning on and off

I purchased my TV in August/September 2017.  We loved the picture and expected it to last 5 to 8 years.  Imagine my disappointment when the TV started cycling turning on an off on it's own earlier this year.  I called Samsung and the tech instructed a reset of the TV.  This helped for awhile but now it has started again.  The TV will work for awhile then start cycling power on and off every 30 seconds none stop until I unplug it.  It's at the point that I am at a lost.  I have looked at different things on this forum and have not found anything that works.  Any suggestions?