So my MVP has been having some issues and I'm hoping you can help. So it's started a while ago but where the tank screws on, like the unit itself, spins. So when the tank is fully screwed on it still spins on the unit then locks itself into place. Now although I knew it was a problem it never really affected anything. Now it seems like when the tank and the unit are locked in it won't heat up. So I backed it off a little and now it works. But I can't keep it from spins when it's at the point of the device firing. Anyone else experience this, and is there any helpful hints or advice? Oh and I've tried more than 1 head. TIA