1:You have a bad solder joint on the television control board. When it "Breaks" the TV can no longer see the remote
A technician may (or may not) be able to locate the bad joint and re-solder it for you,, parts zero, time 100 bucks, shop fees ???
You have a Florescent lamp that is shining on the television and causing infra-red interference. TURN IT OFF
Home is where I park it!