I experience the same thing. Also, while a mag is inserted, there is a bit of free play on the mag release.I just bought a new XDS. When doing drills and familiarizing myself with my new weapon I found that the magazine release was very stiff to the point where I could not depress it with my firing hand only. This was the case with a loaded and unloaded magazine. Is this normal for a new XDS?
NOTE: I have not put any rounds through this particular XDS