There are long discussions so I'll keep it short. Your TV tech might remove the cover to give the cold set (must not be hot from running) a good canned air cleaning and might replace some heatsink compounds.
I have an 50" LG plasma tv from 2013 that has started to turn it self off when it gets to warm. It will turn it self back on after 5 minutes or so.
So i'm currently using a small table fan behind the tv to blow air into the vent holes there, and that is enough to keep the tv running with no problems.
Is this normal? And is it worth repairing? Also, what is causing this?
Thanks in advance.