This morning I went to refill the bottle in one of my G-Box squonkers. Pulled the bottle only, filled it, and replaced it. When I closed the battery/bottle door I gave it a firm push to ensure it was latched and the device started constantly firing. The control PCB was not turned on. I removed the batteries, let the unit cool and replaced them. Again continuous firing. I fully disassembled the device and found no signs of faulty components or wiring. I have sent emails to both GeekVape US and China.
Obviously this is a potentially hazardous failure mode that could cause damage to users and property. The firing was intense and heated the entire upper portion of the unit rapidly.