I've got a few of the Aspire ET-S clearomizers and I've noticed some possible problems. First off is the excessive crackling when firing. Usually when it gets real bad I notice a lot of liquid built up on the bottom of my unit (MVP 2) where the could screw into the APV. I was told this is caused from vaping to hard and for a long time. Average time is about 7 seconds Im firing and inhaling. And secondly is when vaping off the ET-S i sometimes feel like a hard substance entering my mouth. The best way to describe it is small little ice crystals hitting my tongue and throat. What's going on with that?