
If your TV is connected to other smart home devices, like SmartThings, Alexa, Google Home, or Logitech Harmony, it's possible some routine or automation is powering your TV on or off by accident. Ironically, the "smart" features in many TVs can often make them seem a little dumb. You may have to search around to see what the setting is called on your TV. Sony calls it Bravia Sync, Samsung calls it Anynet+, and LG calls it SimpLink. It may be called something different, depending on your TV's manufacturer. If it does, but you still want to use CEC, you'll have to start disabling CEC on your other devices until you find the one sending out the random signal. However, when it misbehaves, it means your TV will turn on and off from misinterpreted signals. Open your TV's settings menu and disable CEC to see if it solves the problem. It can be a very convenient feature when it works as intended.

For example, when you turn on your PlayStation, CEC can automatically turn your TV on and switch it to the correct input, without you having to grab your other remote. Consumer Electronics Control (Opens in a new window) (CEC) is a feature that allows your devices to control each other over HDMI. If I were a betting man, I'd put money on HDMI-CEC being the culprit of your power woes.
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