At the time you purchased, Sharp was the best thing on the market in an LED/LCD tv. Now they are made by Hisense. Try cleaning the connector cable, and making sure that the heat sink is still good on the upper board. It is not a serious problem yet, or the little vee logo at the bottom center of the bezel would be flashing a trouble code.
If you decide to buy new, I would go with an LG. Do not buy a Samsuck.
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