Just got my order for the e-smart clearos. Filled one and vaped away. Loved it. Once it got bout half way empty I refilled it. Now all of a sudden I am getting a really bad burnt or chemical taste. It is so bad it actually burns the back of my throat. Tried a second one and have filled it a few times but not getting the same thing. Any idea what could be causing this and is the clearo pretty much shot???