Obviously the mag catch is not engaging completely; could be that the catch is not fully engaging, the engagement surface is damaged (?!), or the mag catch recess deformed somehow.
The setup is just like that on a Glock, so anyone that works on Glocks can take it apart and look for those things. I had mine apart recently after a mild KB (bad "remanufactured" ammo) and had to file a burr off the mag catch metal surface. It's a dirt simple system and there's only so much that can go wrong with it.
S&W has excellent warranty coverage on Sigmas, so you could simply call them. They will probably fix it at no cost to you and pay shipping both ways.
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