This is pretty well covered here but I did have a small similar issue with my first Gen4.
I opted to send mine back and received the new RSA with 043 stamped on it along with the new ejector........Problem Solved. What number is stamped on your ejector?
In the attached pic it shows the original 336 ejector and the new replacement 30274 on the same gun. If you don't want to send your weapon back and be w/o it for a couple weeks I have noticed many vendors are now carrying the 9mm Gen4 trigger housing that have the new ejector in them for around the $14-15 range. At the time when I sent mine back in December that wasn't an option or I would have done that.