Regrettably I can't tell you how to fix the slide lock issue although what your saying makes sense. To take the mags apart for cleaning, if they are like all the others I have seen, disassemble by pushing the round button or pin at the bottom of your base plate in with a phillips screw driver, etc. and slide the base plate pad off with your thumb. Be careful though because that button is the protruding part of the inner base plate connected directly to the spring assembly so it will be under tension. With thumb on that secondary plate release the tension and slide the whole inner assembly out comprising of that plate, spring and the follower. Bummer to hear about your mags and hope you can get it sorted out. Strange to happen with all 3 mags. Got some knowledgable folks here though that I'm sure can help you with that part of the equation.