Try using your Fire Stick with a different TV.

If the TV is still turning off then there’s likely an incorrect setting on the Fire Stick.

Try using a different HDMI port on your TV.

The problem may not be with your TV but rather a specific port on your TV.

Try connecting your Fire Stick to another HDMI port, and check to see if the problem persists.

Connect your Fire Stick directly to your TV.

power cycle your Fire Stick.

By power cycling your Fire Stick, you might effectively restart it.

Unplug your Fire Stick from your TV, wait 30 seconds, and reconnect it.

This can solve all kinds of temporary glitches.

Check to see if your TV supports HDCP.

Reset your Fire Stick.

Once reset, reconnect it to your original TV, and check to see if the problem persists.

Amazon support will be able to help you determine where the problem lies.

As such, there isn’t an easy way to know what’s causing the problem without troubleshooting.