I've had mine for about a week and have experienced issues with this as well with both stock coils. Majority seems to be from the airflow, but I had some in the mouthpiece tonight as well. Now I have not taken it completely apart to clean it yet, I've been leaving the top on. I have some other 1.2 coils I can try, I will replace the rubber seals and plan to try the rba. I'm gonna try all options because it's the best Vape I've ever had lol.