Has anyone used this cup with the drinking straw? Used it for the first time today and it was fine, didn't leak at all. Drake finished his drink so I just topped it back up. It won't stop leaking now. If u shake it or even when u drink from it it's leaking out of the little hole just in front of the straw and just pours out if u tip it up. I've taken it apart a few times, but nothing's changed. Can anyone help?