Do you know if any of the rods were resized? I run a machine shop and I see many such jobs not correctly done, which means the surfaces ground are not even, and when resizing on a honing machine the big end and small ends ar not parallell anymore. You cannot check this simply by measuring; you need a rod fixture to show it, and then bend/twist the rod if it is twisted or bent. If a bent or twisted rod is not corrected it will make the bearing run on the edges, and that can take out the bearing when you load it. Check the other bearings to see if they have abnormal wear, and ask your machinist, or check your bill if it is specified.