Hey just saw this thread. One question I would ask
did any of them die while they were powered on or did they all work then the next time you tired them they did not possibly indicating a startup spike?
I did notice something that disturbed me a little playing with a ben boost the other day. It may be a fluke but has anyone else seen this. I test all my drivers on a bench power supply which normally I will set to 4.2V but I will also turn it up to 4.4V to make sure the current does not increase and on the one that I tested it did increase the output current. I have not had much time to play with these driver as I only have a couple of them and I was saving them for a build.
Batteries can have small voltage spikes on startup which if these driver do increase from their set current with excess voltage could be creating a startup spike. I will test another when I get home tonight.
I would aslo not recommend going over 450mA with the S06J as they can be a little bit of a crap shoot around 500mA+.
Also I have sold a tons of these in the module combo's with microboosts preset to 450mA here and on eBay and I have only had one report of one dying and I eventually found out they used two li-Ions with the unit. All I can say is I have used hundreds of these diodes and have not had issues with them dying like this. If you are seeing multiple diodes in a row die there must be something else going on.