I bought a rta lemo tank and it was working perfectly, great airflow and taste. I replace the coil and cotton, everything was running smoothly. vaping at 1.8 ohm resistance then all of sudden the airflow jammed up. It's such a tight draw I can't even hit it. I've literally tried everything. Took everything a part. Rebuilt another coil, opened the airflow valve, made sure everything was in place. What's happening? Can anyone help? Thank you