I have had my Prodigy v2 for a few weeks now, and I burnt out a few atomizers... but, I have to say, it was probably my fault. First of all, I had been using the same few 510 atomizers for the last few months, so the solder was probably already starting to creep on those. And, second, the atomizers only blew when the atty was getting to hot. The coil didn't pop or anything, I'm pretty sure that the solder just melted off...
Now, as to the cause... I, like everybody else it seems, am having some switch problems. But, for me, it seems like its just corrosion/arcing on the switch contacts. When it stops firing consistently, I just open it up and scrape the corroded contacts, and it works fine after that. My problem is that it keeps happening over and over, specifically on contact on the battery side. I think that its just not perfectly flat, so it arcs unless you smash it. And, if I'm too lazy to open it up and clean it, I end up just pushing harder/longer, and I overheat the atty. Of course, the atty itself could just be overheating due to being old and resistance.
In fact, I was about to do exactly what jingleballs suggested, which is to put some conductive paste on the contact points. So, I'm glad to hear that worked!
All in all, I would rather have a switch that's easy to open up and clean than one I have to resolder... Still, it is annoying. But, I have a feeling that when I do what jingleballs suggested, it will probably work fine.
Keep your atty's clean! Keep your contacts clean! And happy vaping!