You are exactly right Miro - It was poorly fitted from day one. The replacement has had no issues.
I was worried as I needed to replace the original after 3 months that this would be recurring. Thankfully not.
Amey, I've met you in person. You weren't smug then. Why now?
A few thou' kms for a BB is not good @TRA. Two or three, maybe more each year?
My guess is it wasn't fitting well. Perhaps the frame wasn't faced.
I have a basic GXP bb on my winter bike and it's been ok. The Apex crank threads are cheese but that's another story.