It also may be the fact that at times, I can stretch the side of the case that has the stationary magnet (top of case) far enough away from the BB as I pull it out. In this case, the top magnet does not affect the message and it opens. It all depends on how you pull the BB from the case. It could also be where the sleeper feature is located on the BB (7130 vs 8700).
Keep testing and see if you can make it happen as I described. I just think its a flawed design to have another magnet near the top of the case. I don't like velcro that's for sure. But if the flap closure was futher down towards the bottom (like the Verizon leather case) it would not exhibit the 2nd sleeper function.