I just purchased one a few months ago in July. Three or four times already I've shaken it without the top snap snapped down- worn my protein shake. So far it's only happened to me in rooms without rugs. I think I'm just gonna go back to mixing all my drinks in my blender. Has this happened to anyone else or am I just loosing my mind forgetting things all the time?...Funny thing hasn't happened to me using a shaker cup...