So I have a typical dct smoktech I think, nothing fancy or anything, 3.5ml. First couple fills were flawless, I fell in love. Last fill, like the 3rd or 4th, I let it set for a day, just cuz I was vaping something else. Well, I go back to it, nothing but air... I'm so bummed! Was I wrong to let it sit? Can I fix it? How? I don't understand what's happened with it, it was doing fabulously, now its just air. I am still new with it tho. Help?