There is definitely some funny stuff going on here, no pun intended.
I will start off with the Chamelion connector, this may help. When was the last time the connectors were disassembled and cleaned? They require at a minimum a bi-weekly maintenance - a quick trip in jewelery cleaner and woila bam

Taking a rubber eraser to the negative post (bottom cap) as well as the top sector (top and bottom) also pays dividends. If the brass is shiny = good conductivity, if it is dull = not so good.
Also another tip: If your batteries seem to be getting warm and the atty gets unusually hot (hotter than normal) you have a connectivity problem. That is why I like mechanical mods, they are easy to troubleshoot 
This is good that this stuff gets reported. Are these second batch 306 or 1st batch? I have yet to have a problem with any of them. They have worked flawlessly on:
- P18 and P10;
- Screwdriver MKI;
- Chamelion;
- Omega;
- Silver Bullet;
- eGo;
- std 510 batteries;
- all my box mods;
- GLV2; and
- Icon;
I do not own a ProVari so I cannot comment on that. I do know that on the Icon they did not go all the way, but that was also a disclaimer on the PS site. However they did fire.
WRT maintenance I cannot emphasize it enough. I acquired the P10, Icon, SB and GLV2 off the classifieds as a package deal (for a steal). After reception I knew whay they were on the classifieds. I PMd buddy and ask him when was the last time maintenance was done on them. He stated never. That was painfully obvious. The threads were gunked up, the connectors were oxidized etc...
After a thorough cleaning they all performed like champs. Buddy had acquired these in a trade, and had only used them a couple of times each. I can see why. The P10 was the one that really caused me concern has I had a P18 and the P10 was performing like a "mall ecig".
There maybe some underlying reasons (different reasons) but I share what I know and hope this helps, if niot here it is guaranteed to pay dividends elsewhere.
