I'm having a very similar experience with my Gen4 23, which I bought new last summer. It was fine with zero malfunctions through about 1200 rounds, but the last two times I've taken it to the range I've had multiple FTFs. Mine are all nosedives, with the round sticking on the feed ramp. Two of these were on the last round of a mag (different mag each time), but the other two were somewhere in the middle of the mag.
These were all with 165 gr. WWB. Still in the process of troubleshooting to see if it's ammo or gun. I don't think it's mags since I have 8 different ones and have had malfunctions with several of them. Thinking of polishing the feed ramp, but I've never had to do that with any of my other Glocks...guess we'll see.
G19 Gen3, G19 Gen4, G26 Gen2.5 G26 Gen3
G23 Gen4, G27 Gen4
G30 Gen2.5, G30 Gen4