Quick question - are your mags brand new 10 rounders? (as opposed to pinned hi-caps). If they are, load them up and store them loaded for a week or so. I had some similar trouble with my brand new G22 for the first little while. I would like to mention at this point that I never had any trouble at all from my G35, but the mags weren't new and they were always stored loaded. The point is that the mag spring tension might be causing you grief. Anything else going on, like a laser or tac light? Again, more of an issue in .40, but hey.