Hi there. Looking for help here. Got my ProTank II last week, and it worked like a champ on my Vamo. Now all of a sudden today, they will not play nice together. Just a gurggling sound, no vapor, no taste. So I replaced the o-ring on my Vamo post again, and still no go. Put the ProTank on my Gripper, vapes like a champ. Ego VV Battery as well, very little vapor. Back to the Gripper, works like a charm. Replace the head, install just that on the Vamo no go again. Put ol'reliable T4 and Mini Nova on the Vamo, vapor galore! What gives here. No there is no fluid in the Protank, and no noises when in use on my Gripper. So does anyone have any ideas as to what is going on? The only thing I am thinking is that there was a little bit of leakage around the last o-ring that was on there and am worried that it may have gotten inside. I tried getting the top off with no luck either by following the online video so I may clean the inside of it. Thank you.