I have a mini vivi nova that I've filled three times now and cleaned once. Since day one, it as made not a sizzling sound but more of a sound similar to a stun-gun accompanied with a frequent pop sound. When it makes the pop sound, it shoots a very micro vape ball into the air about 18 inches high. It reminds me of a micro roman candle or little missile complete with vapor trail. No light, just a thin thread of vapor. Is this normal?