Had a great morning at the zoo yesterday shooting with my E-M1 and 40-150 f/2.8. Took some great shots but had one very scary problem. At least 4 times, I looked down and my lens had come loose from the camera. Luckily it only came totally unattached once and I was holding the lens and the camera was swinging on my neck strap. At first I though I had hit the release button, but I had it come loose again when I was consciously avoiding it. The button and "click" feel normal, but I suppose there is the possibility of a faulty lens release button when using the heavier lens. Anyone else have this problem? What should I do to prevent lens disaster?