used blower 4 times since buying it and has stopped running 3 times. Took it to a repair shop 3 times and spent over 200 dollars and it still stops running after 15 minutes of use and won't run again for at least an hour. Was told by repairman to bring it back to sears . What is my next step, can't afford to keep investing money in a product that was practically brand new. Please respond to my problem about your product!!