I just got my protank 2 today. The guy at the smoke shop assembled it and filled it for meand I was happy with it . Once the liquid got low it started leaking liquid through the mouth piece and stopped vaping. I figured it was just because it was low so it took it apart and cleaned everything. I reassembled it (made sure the threads matched up and everything was sealed right) but it's still making a gurgling sound and leaking liquid into my mouth. So what should I do?