I've had it happen with my Volt X2s with clearos too. It doesn't happen often, but it can and will if you overfill, if it's getting too much liquid into the wicks, or if you've built up condensation in the tip. If you're using manual batteries.... take your finger off the button before you finish your draw to minimize condensation. If you're hearing a gurgling sound, twist a kleenex or napkin and dry out the tip... also take the clearo off and dry any liquid that's gotten into the battery post... vape more vertically to get some of the liquid absorbed so you're not over wicking. Oh... also make sure the silver rings top and bottom of the clearo are on there securely.