The PB-207 is a highly regarded (extremely expensive but owners love it) higher than usual quality torch lighter with a great rep. Unless they are counterfeits, I think the odds of 2 failing are pretty low. I'm betting it's the butane, as bad butane (like Ronsen Red) can kill anything. The good news is after a good purge and refill with quality butane you should be able to bring them back. Purge and burp those babies... Be sure to burp out air that you get while filling.