I am having a similar problem with a PX4 Compact purchased a month ago. I checked the spring and it is the new version. Also, be serial number, the Beretta site reports the spring fix is not needed.
I am having some FTF problems and the slide doesn't stay open after the last round. Additionally, I see the ejector (chamber loaded) indicator moves out only .010" with a live round and less than .004" with a snap cap (Feeler gauge measurements). I suspect these issues are related.
Initially, I contacted Beretta support and they suggested running 500 rounds of 124 or higher grain ammo through it, which I did. While it seems to work reliably with the 124 grain ammo, it doesn't with 115 grain ammo (Winchester, not reloads).
I clean and relube after every range session. I have serious concerns about the reliability of this gun for personal defense. Is there anything else I should be doing other than contacting Beretta support again, which I just did?
Appreciate any thoughts or advice.