If your PlayStation 3 starts to turn off by itself, there are a few things you can do in order to prevent it from going out of commission. First, make sure that you have charged your PlayStation 3 battery. If it has been inactive for a while, it may need to be recharged. If the battery is not charging, try turning on the power cord and plugging it into an outlet. If that does not work, then the power cord may be damaged and needs to be replaced. Additionally, make sure that your PlayStation 3 is in a good condition by cleaning its interior and exterior with a mild soap and water. Finally, make sure that you have installed all of the latest updates and software in order to keep your PlayStation 3 running smoothly.