Try blowing in a cooled down cart , and see if it has too much juice in it ( from the mouthpiece ) , or your drip tip . If a lot of excess juice ( there should be some ) comes out the small hole , you more than likely , just flooded it (too much juice ) or like Womanofheart said , you were chain vaping , and got the carto too hot . Slow down a little between draws . and take slower easier draws ( not at all , like a cigarette )