Snow Blowers

I PURCHASED A NEW HUSQVARNA 230 E SNOWBLOWER FROM LOWES 4 YEARS AGO-HAS WORKED EXCELLENT EXCEPT FOR THIS. IT HAS DONE IT SINCE NEW--AFTER RUNNING FOR A WHILE EVERYTIME AND YOU RELEASE BOTH DRIVE AND AUGER HANDLES THE AUGER AND IMPELLER CONTINUE TO RUN. IT HAS LIGHT USE AT MY HOME ONLY--NOTHING IS STUCK OR HAS THERE BEEN ANY THING STUCK--NEVER BROKE A SHEAR PIN. I CALLED THE 2ND WNTER AND THEY SAID TAKE IT TO LOCAL DEALER--SUPERIOR SAW--I DID THEY CHARGED ME $55.00 WHILE UNDER WARRANTY AND SAID IT WAS AN ADJUSTMENT--NEXT WINTER WAS DRY AND USED MAYBE 2 TIMES AND IT DIDNT DO IT--THIS WINTER EVERY TIME I USE IT AUGER STAYS RUNNING.