I've always really liked using carts because they're not as messy and don't leave a smell, but I've had a recurring problem with them. I've used 3 different batteries, but somehow the liquid always gets too thick and clogs. I end up having to roll the cart around in my hands and get it warm before I can take a hit. But I have to do this every time i want to take a hit. Is this common or am I doing something wrong? Am I using the wrong carts? I have a medical card so I get them from the dispensary. There's only one brand I've used that seems to be immune to this problem, but they're not always available. It bums me out because carts would be a much better option for me currently, but I mostly just smoke flower because I can't figure out what I'm doing wrong.