String Trimmers

I purchased my Poulan Pro string trimmer PP025 SN 12032N5000685-2 April 2012. After 1 use (for an hour) the cable on the outside of the engine which connects to the shaft separated from its white plastic clip/connector. The wires pulled out of the clip/connector. The placement of this wire outside the engine, near where the hand grips the handle, leaves it open to accidentally catching on either the hand or a branch or any object. I was able to replace the wire, and the unit operated properly for another hour on another day. During the 3rd use, the engine would not stop when pressing the STOP button. The only way to get the engine to stop was to disconnect the spark plug, which causes a dangerous (and painful) shock. I cannot use the unit at this point, and it needs to be replaced or repaired. Should I contact a local dealer for this, or would you like to address the issue?