My fluency gets way better during the summer. I know what you mean and what you've felt. What I also haven't realized is that I'm actually under constant anxiety and stress, because during those three days I felt absolutely no anxiety and no stress. I didn't continuously shake my leg while I was sitting nor did I have the urge to walk around whenever I was waiting for something. I just refuse to accept it's due to a random factor that we have no influence over.