It will continue to fire in the PCC randomly. I have one battery that does it and one that doesn't. After writing a few emails to Joyetech directly they said they had never heard of the issue. Any QC or warranty issues must be handled with the vendor. I had to send them multiple emails just to get them to respond. The vendor has stepped up and will be replacing the entire kit. I'll update when I know more.
Sorry for your problems! Glad to hear that the vendor will replace your kit though. They will probably send it back to their supplier and they in turn to the manufacturer.
By the way, why did you think that Joytech China could/would replace the end user's product? They would need a whole department staffed by hundreds of English (and Spanish, French, Polish, Russian etc.) speaking staff to deal with thousands of daily queries, complaints etc. etc.
The way I see it, it's like contacting Mercedes Benz in Germany and asking for your car that you bought from your local dealer, (who in turn bought if from the importer, who in turn bought it from....) to be replaced to you privately in the US. Lol... OK that was a terrible analogy hehe... But something like that

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Keep us posted.