Mine has over 60 flights on it and the same problem has cropped up twice after a little excessive sideloading of the gear in a crosswind. What usually happens is they retract but will not extend. Here is the fix, but be careful not to break the gear mounts...go slow. To extend the gear when it does this push up on the gear to unlock it. Once its extended you need to "tweak" the gear outward toward the wing tip, just slightly. Yes it takes some force but nothing excessive. The gear will then work fine until the next time you side load them too much.