I recently got a 4nine from a local shop and have noticed that I am getting a hot button once in a while within a fraction of a second of firing. I actually saw a spark the other day and it freaked me out. I really like this mod and curious what the problem is. My battery and atty works fine on all my other pieces. I want to use but i'm worried. Please help, is their a flaw to this design or can I fix it somehow. Thanks