I have three Joyetech batteries. I have had them all different amounts of time (not too long). And I have 3 Protank 2s. Within a week of each other, all three tanks just started getting loose. Now, none of them will screw in at all. I have to literally hold my tank onto my battery while I smoke. It is quite ridiculous. There has to be a way to fix this. Some sort of glue, or coating I can put on them? I am a bit broke at the moment and can't afford to buy any new equipment.