Sounds like the mop head isn't screwed down tight. That's why I had leaking on mine. Also my clear tank tube that came on it didn't seal properly and I had some juice seep out very slowly. I bought the metal replacement tubes and they were fine. Also don't know if you tinker and are able to make coils but they are very easy to rebuild those coils on the vivi heads. And I use cotton yarn not silica wick. Cheap way to go and flavor is much better for me. Either way good luck.
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Its funny you say that. I went from a solid metal black one with no issues and now I just switched to a smoke plastic so I could see my juice. Maybe it is my tank not sealing good now. The first rebuild I think the rubber cap might not have been down enough. I fixed, tightened everything and refilled and now Im getting just a tiny bit of moisture on the outside that may be coming from a bad tank seal. I think Ill just switch back to the solid metal one if this keeps seeping out juice. Thanks for sharing your experience on this.