I've had the same problem on occasion, I vape with a carto tank and a provari. What I've noticed is that when I'm vaping at higher temps the juice gets thinner and more apt to be sucked up. What I do is turn it down for a little bit, or just leave it alone until the juice in the carto cools off. Now I vape at anywhere 4.2 to 4.5 and don't have the problem and the taste comes through better. It happened often when I was doing 4.8 to 5.2.