I guess back in late 2012, they had a bad run of 55gr 5.56 bullets (case separation); I got a case of 3500 back then right as the run was starting. I set them aside until last month and loaded 500 and I had the same problems....glad I only loaded 500 of the 3500.
I emailed them today; they responded immediately, and told me it was a known problem. they don't make the 5.56 right now but they gave me a case of 9mm and it shipped an hour later. I thought that was pretty cool especially since it's been three years.