wilson cqb 10mm

My Wilson 10mm CQB will FTRB on the last round every time. Gun is right around 500rnds. Seems like the problem has become a constant and not an occasional. It does it with both the WC 9rnd mags it came with. Doesn’t matter if it’s only 2rnds or 4 or 9 in the mag, every time on last round it will...