How do I fix the issue of the Smart TV turning itself off?

Reset the TV settings: Power off the TV and unplug the power cord from the outlet. Wait approximately 10 minutes and then plug the TV power cord again. Re-configure the TV settings.

Connect the TV to the Internet and Update the Software: Connect the TV to the Internet and check to ensure the software is up-to-date. Depending on the model, this could be done automatically or manually.

Perform a Factory Reset: If troubleshooting does not resolve the issue, try performing a factory reset. This will erase any customized settings configured and returns all settings to their factory-default values.

Clean the TV internally: If the TV is still exhibiting the same issue after a factory reset, it is possible internal dust or dirt is causing the issue. Bring the TV to a professional for recommended cleaning.