That is a fairly common problem..It seems the bottom portion of the filter stays moist but the upper half gets dry quickly
If you only take a drag or two every now and then you give the atomizer more time to wick up juice, but if you use these like a cigarette and take lots of drags in a short amount of time you aren't always giving the atomizer enough time to wick up more juice in between drags.
Many people eventually move on to using a better filler material that wicks faster.
You can learn all about that in the cartridge mods subforum.
And many people just start dripping, and stop using any filler material at all.
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