Hello. I got a vaporshark rdna 40. Been using it for 4 months now. Suddenly it went haywire. As I put my atomizer and turn it on, it started to fire by itself. This only occurs when:

1. The wattage is more than 3 watts.
2. If the wattage is 1 watt. It will not fire.
3. If i bumped up the wattage from 1 to 3 or more watts, it will not fire first.But when I press the fire button then it will fire and won't stop.

Any suggestions of what the problem is?