2005 MAZDA MX-5 MIATA Electrical System Problems

I HAVE HAD THE HEADLIGHT COMBINATION SWITCH, PART NUMBER NC11-66-122 FAIL IN THIS MAZDA MIATA 6 TIMES. AFTER THE FIRST REPLACEMENT I NOTICED ALL THE SUBSEQUENT FAILURES WERE DUE TO A MECHANICAL FAILURE IN THE SWITCH AND NOT AN ELECTRICAL PROBLEM CAUSING THE FAILURE. WHEN THE SWITCH FAILS, I TURN IT TO EITHER PARKING LIGHTS OR HEADLIGHT POSITION AND THE LIGHTS WILL NOT COME ON UNLESS I PHYSICALLY CONTINUE TURNING THE SWITCH PAST IT'S "ON" POSITION. SOON AS I RELEASE THE SWITCH AND IT FALLS BACK INTO THE "ON" POSITION, THE LIGHTS GO OFF. THE FIRST 4 REPLACEMENTS WERE PERFORMED BY MAZDA DEALERS UNDER WARRANTY. OF COURSE, THEY DO NOT TRY TO FIGURE OUT THE CAUSE OF THE FAILURE, THEY MERELY REPLACE IT. THE FIFTH REPLACEMENT I WAS ABLE TO KEEP THE DEFECTIVE PART AND I DISASSEMBLE IT AND FOUND THE CONTACTS WERE NOT TOUCHING UNLESS THE SWITCH WAS TURNED...