My Apple TV keeps turning off when I try to watch most things on it and I want to know why???

Does the device actually turn off, or is your program merely interrupted?

• For the 4K model: Is the cooling fan at the bottom able to do its work? Is it on a flat smooth surface with room for airflow? Overheating can shut down electronic equipment.
• Are your HDMI cables fitted well in the ports?
• A Reset and Update may make the device as new and working properly as intended. (Any customization may be lost; you may need to re-download apps, so make note of which apps.)
• Verify your network