My friend started using a PV last week using CE5 clearos. Last night, he got a mouthful of vapor, so I took it and started to inspect it. I noticed the tube was spinning freely from the bottom metal piece that threads onto the CE5 base. I was able to remove it completely, clean it, and it sort of "snapped" back onto the metal piece, screwed it back onto the base, refilled, and he was good to go. Are those tubes supposed to be able to separate from the metal collar?