I was wondering if anyone can help me, I can't get my tubing to stay connected to my contoured cups! I put it on then it slides off, it's so frustrating!! They'll be good for a while, and then one side will keep popping off, now tonight both of them wouldn't stay on, I finally gave up! I've only had this problem with the contoured cups,not any of the others, I don't know if it's because the connectors are stubbier then the other cups or what Any body have this happen?? What else can I do to keep them on besides superglue them? Any suggestions would be appreciated!!