I've been using my racquet with the same poly strings for almost a year. I got it earlier this year in January, and have been using Lux ALU Power 16L strings. I played about once a week for 2 hours up until June. Then season started in August and ended at the end of September, so I was playing every day for about 2 hours during that time. I heard poly strings go dead with like 12 hours of play time. I'm a 3.5 player, so not super intense. I recently participated in a tournament (just level 8; first one), and my elbow started hurting really bad from serving. I could still grip my racquet when I hit shots, but waiting for a serve return, I couldn't really grip it. I just watched a video and the guy said that if you have elbow problems, it might be because the strings are dead. What are some ways I can tell when poly strings go dead? And is my elbow hurting because dead strings or over swinging?