If it is consistently on the last round, that sounds like a magazine problem.
I've never had a problem with my Magnum Research Baby Eagle, but I also realize it's biggest weakness and any semiauto's biggest weakness will be the magazines. It's inherent in the design.
Not a .45, but every issue I've had with my Golani has been magazine related.
"For every problem there is always a solution that is simple, obvious, and wrong." - Mark Twain