I had the cartridge bearing in a Speedplay disintegrate on my fixed. My pedal felt weird but it kept spinning. I kept riding it until it fell off the axle. Then the cartride was just gone from the spindle grinding on it. I got a new cartridge and it worked fine.

Has anyone thought that maybe pedal strike isn't the best thing for these pedals? Pedal strike on a fixed gear is a very stressful thing. Maybe some pedals can't handle it?