Anyone ever have issues with mag drop on a Sigma? I first noticed it when shooting off a range bag, the butt of the gun resting on it. Then the other day while practicing strong hand only, dropped two outside the 'booth', (had to wait for the range to go cold to go out and pick 'em up). Pretty sure that was me 'thumbing' the release. This last weekend the mag came loose twice, couldn't really put a finger, (thumb), on why. I was watching to make sure I wasn't hitting the release, with two thumbs, the right thumb is on top, the left against the frame near the slide. Any ideas?