My fire button won't turn my mod on. It'll recognize that I'm pressing it but won't click 3 times to turn on. I have the innokincell D50 mod. Have taken it to th local shop I bought it from but they just got me to buy a whole new and different mod. They stopped carrying the D50 mod and said they couldn't fix it. I really like that mod and would love to be able to fix it somehow if I could get the correct advice on how to do so! Help please. Thank you!