Well I received my unit the other day and was experiencing the same problem of mis-firing.
I posted a question about this over on another forum and folks there said that I may just be holding the button in too long as the Provari has a 16 second cut off safety mechanism which is a possibility and I also dropped Provape a message yesterday about this problem and here was their reply -
Hi Marcus,
I think I know what the problem is.
There is a plunger on the circuit board that when pressed down by the button, activates the board. Now, because the button floats on top of this plunger and because the menu is accessed through a series of pressure changes on the plunger (i.e. button pushes) if you do not apply firm, consistent pressure to the button, it can activate the menu function instead of firing the atomizer. What do I mean about firm, consistent pressure? I mean don't roll your thumb from side to side while you vape or waver with the pressure. Rolling your finger from one side to the other will change the pressure on the plunger and it will start to access the menu function. When it gets into menu function, it will stop firing.
I used to do this all the time myself when I first got my ProVari and I would even find myself in the power up or power down function... or even get the -- between functions. As soon as I realized that I was wavering on my pressure and became more consistent, this situation was drastically reduced.
Basically, no indecisive vaping is allowed on the ProVari (humor intended)
Kindly,
Cecilia
So I have followed the advice above and the advice about the 16 second cut out received over on the other forum and I have had no problems at all today...so the mis-firing problem may be yourselves causing this to happen and not the Provari.
I hope this helps anyone else experiencing this.