I bought a 3.5 ml dc tank and some replacements carts a couple months ago. Been using it on my auto diamond titan batteries and it's been great. Switched the cart out twice since with no problems. I've only used one flavor in it, a 50/50 blend from vapor chef.
Here's my problem. Last night I put in a new cart, filled it up with the same flavor. Business as usual, or so it seemed. Within just a few minutes of vaping I got that burnt taste. A couple dry hits took care of that, but then it happened again, and again. Looking inside the cart after I get the bad taste, the material is always too dry looking. Also, the liquid level in the tank hasn't dropped as I've been vaping.
I don't think it's wicking correctly. The cart won't fill itself from the tank.