How long did you have your Rev 2. After 2 1/2 months the button was going out on my both wife's and mine.
I don't know for sure but I would guess 2-3 months. Great, now I have something to look forward to. I don't use it full time though because I have so many other PVs. I rotate around all the time.
What I've been doing when vapor reduces is give a quick squonk and that seems to be working great. No gurgle. I'm in love with this Reo but it is a bit heavy for my little hands.