Why does my Ninja Blender (NInja Ss351) stop blending after 10-15 seconds and then continue to blink even with the power pitcher on the base or any of the Nutri Cups or Nutri Bowls? After blending for 10–15 seconds, the base led blinks as though the pitcher is absent from the base. After turning the machine off for about 10 minutes, the same cycle above will start again