Definately some sorta solenoid problem. I find it rather unlikely that it would concern the hose, unless it has been previously tampered with. If any debris has worked its way into your minifold, it will have been blown into the solenoid when you gassed the gun up, hence the popping noise and resulting leak, it's very doubtful your hose would pop by simply gassing the gun up. Take the frame off and let me know where the leak is coming from. You will be able to tell if it is the hose because the leak will change tone as you move it around the barb.
If it is your solenoid, which is what you seem to be describing, then i would advise bringing it into Planet.