PockEx issue

I purchased a pockex a few weeks back. It was working fine initially and then in the last week it wouldn't come on, so I tapped it on the side and could see flashes or orange under the button and it started working.

This morning, it started doing something different - anytime I press the button it blinks twice and then nothing. I changed the coil - same thing. When I unscrew the coil it stays on and blue but as I tighten the coil the blinking starts.

Is the unit broken?
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