This is a common problem with 3-year-old + Samsung 50-65 inch TV's. This advice is given with the pretext that you know how to be safe and use tools.
Locate the IR sensor on the front of the TV. Remove the stand and place it face down on a carpet. Be prepared to be able to leave it there for a few days as your replacement needs to ship. Remove all the screws from the rear panel to locate the IR or touch function/IR combo board. Carefully remove the board, get the board number that is located on the side you can not see without removing it. Since I do not know this number as there are different versions, this is a sample if what the IR board should look like. https://images-na.ssl-images-amazon.com/images/I/41wWeOocaHL.jpg
Replace it with a new one. $30 max. Put it back together and you can control your TV again.
Suspects its main digital board. But, before a replacement, contact any service technician, and make it sure. This board cannot be replace by the user, as, there might be a software update necessary after replacement.
This sound likes the incoming signal is week. You should play a DVD player to see if the problem stays same or not.
If you try all sources ie HDMI, AV Component, etc...the TV show the same problem. There are two possibilites: T-Con board or main board need replacing. You should need technician to figure out the problem. Hope it help.
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