Shield Plus slide not locking back on empty 10 round magazine.

[MoGunGuy]

I got a Shield Plus 2 months ago. No problems with the night sights but both my 10 and 13 round mags won't lock back on empty and neither does the 15 round mag I bought for it. I thoroughly cleaned it before first shots and again after the first 200 rounds. It's really annoying. Almost as annoying as still not receiving the free green dot that was approved 2 months ago.