I made my first batch of e juice on Saturday. I used Loranns flavorings and a few capellas. They tasted really good at first, but now they taste good when your first fill the clearomizers but they get this kind of burnt rubber taste every once in a while. It's really bad. What did I do wrong? I did 1ml flavor added 20 drops EM and a 1/8 tsp sweetener and my base for 10ml bottles. I got the premixed vg/pg bases in 12,18,24mg and the bases are food grade. PLEASE HELP!! I'm sure I did something wrong!!!!!