This has happened twice to me actually. Both times I thought it was a wicking problem and I was getting a dry/burnt hit, but this didn't seem to be the case after further examination. I use a Lemo as my rta and if you pop the drip tip off you can actually see your coil/build pretty clearly and the wicks looked saturated; I still drained my juice and took it apart both times and couldn't find any issues that would cause such a problem. Since I've never had anything like this happen to me when I've used store bought/vendor liquid, I'm assuming it has to be my DIY stuff (I'm new to the diy thing, just started mixing a few weeks ago). Is it possible that the flavoring in my liquid is somehow separating when in a tank? I always give my bottle a good shake before I drip, so maybe this is why I didn't have an issue like this on my RDAs. Maybe I need to mix it better (I just give a few good shakes in the bottle every once and a while) or let it steep more. Any advice or insight would be much help. Thanks.