Newbie question here, I'm using 510D Boge LR carto's. A couple of times I've filled a brand new carto, let it settle for a while. When I tried to vape it, I instantly got a mouth full of nasty smoke, tastes like burnt plastic. I've had at least one of them in every 5-pack. Is there something I'm doing wrong? Then today, filled a new carto, at first it was ok, then the burnt taste started creeping in. I like to switch flavors a lot and whenever I started vaping this thing, after 3 or 4 drags, some burnt taste. Now it's completely nasty. Help?