I have an EGO as well and every once in a while I will experience the same thing. This is usually because I vaped a little too long for the amount of drops that I added (I'm a dripper). In this case, I add a couple more drops and everything is fine again. However, attomizers don't last forever and will eventually taste burnt regardless of how moist it is. You might want to try cleaning it and just buy a new one.