Okay, so a couple weeks ago I bought an herbal grenco G-pen micro. I have had multiple problems with it, but the store has been very helpful with warranties. Im on my third battery from them. Up until now, its been great with really good flow while working At this point. I hit the G-pen, its on, its heating, and I can tell that the herb is being vaporized. However the problem is that I am not getting any flow through it. it feels like the air passage is completely blocked. I have tried packing the tanks looser and tighter and ive tried messing with a few things but nothing seems to work it just feels completely closed off. Any ideas on how to fix this?