Is there a round in the chamber? If not, are you able to dry fire to release the trigger? The trigger should be back to remove the slide, of course I'm not telling you anything new, we all know that.
I wouldn't be so quick to blame this problem on the Gen 4, I imagine weird things have happened with earlier generations too. My 23 Gen4 has been just as reliable as my older G22 and I'm confident it will continue to be so.
Good luck and I hope you get this resolved quickly, Alpha1victor
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek