for the past day or two whatever flavor i drip into my rda tastes pretty bland. i get a tiny hint of the flavor but overall they all have a weird aftertaste and just leave me unsatisfied. is this vapers tongue? also throughout the day while I'm working i switch flavors a lot. by the end of the day i have 5 or 6 bottles sitting out without a cap on. do you think that my juices are losing flavor due to such long exposure to oxygen?