Anyone else have this problem? When I look at the coils there is a gap from where the cotton holes are and the bottom of the tank. So, as it empties I sometimes get dry hits. I can rotate the tank and wick the cotton again and it will hit normally. Is this a design flaw? I have the plus and the mini(and I love them both) and have the problem in both. Most of the time, when I'm changing flavors, I end up just cleaning the old juice out before adding the new. Can anyone explain this? Am I missing something?