I have not had them go bad on me....are you positive the bottom connector pin is not out of position? I had to jostle one a bit to get it to work on the itaste. Would not fire at all until I moved the pin. Still using mine from the original box.
Thanks, but I don't understand. I tore one apart but didn't see a connector pin. There's a base with the coil, a tube that pushes into that and that's it. The coil is firmly attached to the base, like a filament of a light bulb, not a press fit.
Turning the head upside down, the center piece, which has a screw head appearance, seems to be tight with no movement. The tube is a press fit into the base and is/was seated so no movement there. When you said "jostle" I thought the coil might actually plug into the base, but, after pulling a coil out of the base, I see it is firmly attached. The coil actually unravels to the point the wick slides easily
through the remaining wind of the destroyed coil.
After reading another post, I tried to scuff up the screw looking center where it makes contact with the battery center post. No help.
Houston, perhaps we have a problem in the manufacturing. At $1.79 each I guess its to be expected, but, is a drag(pun intended) to fill, then have to drain good ejuice, then disassemble, poke around, re-assemble, fill with PG and try again.. Messy too. As these are new, for 808's, I hope they will get better. I have 4 other boxes to go through! If this continues to be the failure rate, I will need to find another product!
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Additional thoughts:
I FlavorPuff a lot, like smoking a pipe. Maybe I am over heating the coil and need to change either to the higher ohm coil or change my method of smoking. Higher ohm coils might handle more current /heat.
, two work OK. 
