Thanks for all the replies.
I've really liked these pedals - ease in/out, good float and mainly bc I can run one pedal system on all bikes, interchange shoes, etc. Which usually means I ride my nice bikes everywhere, even cafe runs.
My main concern is why it occurred. Seems the body rocked enough that the lock nut eventually tore through the sealed bearing at the end of the axle, allowing the pedal body to slip off. Not sure how I could check for that without disassembling the pedal periodically. I've emailed CB - will see what they say.
Other options? I'd be looking for pedal systems that allow road and mtb shoes so that seems to limit me to SPDs. Or am I limiting myself by not getting a road specific pedal?