Used this pack (got the frame and belt used) all last year with no issues. Midway through a training session this Velcro strap that secures the waist belt comes loose. I put it back and a few outings later it comes off again. Now it’s coming off as soon as I put the pack on. Training weight is 60-70 lbs. am I securing it correctly? It just goes through the grommet and velcros to the back of the pack, right? Or would this be covered under some kind of warranty?