During practice today, I was warming up (short court) when i noticed that my racket sounded strange when i hit. I looked at the racket and i saw part of the outermost vertical string sticking out of the racket at the bottom and the strings on that side of the racket were loosening. My guess is the knot became undone Has this happened to anyone before? If this happened to anyone, did your stringer agree to restring it for free? Random details: i had restrung the racket earlier this August, but I have multifilament and the strings are fraying around the sweetspot..