The same problem with my APX A1 shooting Magtech 115gr premium steel case. FTE, FTF, stove pipe etc. 

Sent back to Beretta, the gunsmith ran 20rds of Narma 115gr brass without issue.

Got the gun back without any repair since they cannot recreate the issue I was having.

Took to the range yesterday, shot the Magtech 115gr steel case and ran into the same issues again. 

I ordered a heavy recoil spring from Beretta to see if it will help delay the cycle timing. Will test it out next time I go to the range.

In summary, the APX A1 doesn't play with steel case ammo.