I have a question about the coils for my pen. After changing the coil, I noticed it was popping and cracking, unlike what I was used to hearing. Yesterday, I was about to put my pen to my mouth, and hit the button before I reached my mouth. It popped pretty loud, and shot out oil, into MY EYE Has anyone experienced this before ( not necessarily getting popped in the eye) the cracking sound. Is this a bad coil? I want to change the coil and move on, but I am not sure if it's the pen or the coil. Any information would be greatly appreciated! Thank you in advance