@druidH I fitted the last one myself, i don’ have a torque wrench but just tighten to what seems sensible, not over doing it. Not jet washing.
@bowglie I don’t remember any water in there, but you’ve just reminded me that both times they’ve gone, a few weeks before there’s been a brown liquid discharge from between the BB and pedal arm, which ends up all over the left pedal arm. I thought it looked like rusty water, but as it’s all alu i couldn’t work it out or where it had come from.
My original thought was a seal inside the BB had failed, maybe water getting in and rust is from the bearings? I do ride in all weathers and wash it a lot, but surely it can’t be that easy for water to get in?