i received the product manufactured in feb 14i tried to contact the manufacturer through toll free number given in the manual for demonstrationbut could not contacti tried to follow the manual and started using on the very second day of use while grinding a little amount of rice it stoppedafter waiting a while and using the overheat protection switch it started and again stopped with in a few secondsafter 4 hours i tried with different materials but in vaini tried to contact them for s