My 08 did this also. I calmly explained to my dealer that if I remove even one of my hands from the bars to say turn on the radio, or adjust a mirror, it wants to rip my other hand off the bars. I even felt it when I would grab the clutch. Not having a death grip on the bars with both hands and my bike was possessed. The dealer tightened the head bolts, which were hand tight according to the mechanic, and 23000 miles later and no issues. Just use my example when you talk to the dealer and they will fix it.