Mine occured after about 30 minutes of intermittant use with the first battery it ever had. Once second I turned it on and it was bright, turned it off, later that day turned it on and it was very very dim. I figured the battery had died, and I was seeing the tail of power and reducing light, so I replaced it with a new cell. Same thing. Took that new batter out and put it in my P1D CE, and it worked perfectly. I only use SureFire 123a batteries, nothing else.
Fenix got back to me. Sounds like they were a week beind on emails or something. I am shipping it in today. Thanks! It will be nice to have my P1 back. It is dang handy, and while I like the nifty modes and power of the P1D CE, sometimes I just want an on-off light without modes.
-Chuck