THETA Z1 Shuts down and does not restart

Wondering if anybody experienced any issues when using the THETA Z1 intensively (taking 1000+ images in 3 to 4 hours). In some cases, the camera shuts down and does not start up again for some time (up to 45 min). I have a couple of the Z1 cameras and this is a recurring issue. To enhance battery life, I use a power bank continuously as well to keep it well charged.

When it shuts down, is the camera warm to the touch?

If you’re taking 1000+ images in 3 to 4 hours, is it possible to blow a fan on the body of the camera?

After it shuts down and cools down, try holding the power button down for 20 seconds.