The clasp keeps coming undone when I am using my wrist such as when I go to hold an item or when my forearm muscle flexes in any way.The last time it slipped off my wrist it fell onto concrete and the small pin was dislodged. I did get the pin back in however the clasp constantly flipped open. I initially wore the watch as a loose hug around my wrist, still a small amount of play but because I have a very small wrist the band doubled up on itself until the end butted against the watch face. I started wearing it more losely and the clasp stayed closed longer, however it still came undone but not as often. Can the band be shorter 