I'm new on the vaping world. I bought 3 10ml different flavors bottles for the same vendor. After open a bottle the flavor last for 2 days then each new drop taste almost nothing. It's that normal ? Is the flavor volatile?
I've noticed that some flavors do indeed get weaker as the juice level gets lower in the bottle. I believe that some flavorings are, as you put it, volatile. Generally though it takes much more than a couple of days for me to notice it. When using 30 ml to 60 ml bottles and I'm down to my last few ml, that's where it becomes an issue. I'd say that the others that responded to your post are likely on the right track with your problem.