I was using my eureka Dial-a-nap earlier and taped the on/off button to turn it off it turned off for a second then turned back on with the button turned off! I tried and tried to turn the vacuum off and it wouldn't turn off! Ive never had a problem with this vacuum until now! I had to remove the plug with the vacuum on and that was completely unsafe! It was the only way I could turn it off!....anyone know what could be wrong?....