Used my brand new Husqvarna for the first time today on the lawn. The grass was quite long and a bit damp. All worked well to start with cutter blades set at highest point but then I noticed that when I disengaged the attachment clutch control the blades continued to turn - so I was able to get off the tractor with the blades still engaged. Everything else about the clutch control switch seemed to work normally. If I left the control engaged the engine cut off when I got off the tractor. The problem is I haven't been able to turn off the blades. If I cut the engine, when I restart with clutch control off the blades are automatically engaged. Would appreciate any thoughts for how this can be simply fixed.