in my experience, my problems don't stem from either of these 2 scenarios. I've been re testing my unit every couple days with empty chambers.I have been working with my sales rep on these. Asked about the tanks and why some are getting combustion. Hope this helps.
We're working on both currently. Regarding the combustion that is easy to avoid, we've insolated two ways that can happen. The first being that the contact in the device or on the bottom of the chamber is dirty, or second putting the chamber into the device while it is still very hot. Both of these can cause the resistance of the tank to be outside the baseline when installed into the device. We are testing possible firmware updates to prevent this.
my process is this: turn on temp 3, unit heats up and I get the ready buzz. when that happens I turn it off, let it chill for minute and then start another cycle and this is when the unit enter into nonstop heating mode. note that the first heat cycle worked fine indicating a clean contact with the oven ( and trust me, those contacts aint anywhere near dirty) and I started the second heat after the unit had cooled a bit.