I have a Sidearm and while on the freeway the other day, the arm assembly was lifting up (as in rotating back to the resting position) from the set position making the front tire 'float' in the tray. Has anyone else experienced this problem? I know the easiest solution would be to strap the tire down, but just seeing what else people have done. I did contact Thule, all they recommended was to lock the arm down (duh, it was locked). thanks.