LAST NIGHT I MOUNTED AND SHOT WITH THE NEW TROPHY RIDGE MATRIX SIGHT. I LOVE THE SIGHT PICTURE, BUT I HAD PROBLEMS WITH THE THUMB SCREWS COMING LOOSE. THEY MOVED 2-3 MINUTE MARKS AFTER ABOUT 15 ARROWS. BELIEVE ME WHEN I SAY I CRANKED THEM DOWN.HAS ANYBODY ELSE HAD A SIMILAR EXPERIENCE.