Hi, We don't understand why but suddenly the blender did not want to rotate the knife anymore. In fact, the red light flash and indicates that the blender is ready but when we push the button on, we hear a connection but nothing happened. It worked very well before for about 10 times. We always do a maintenance carefully and no water went inside the module with electronic components. Please help us. The S/N is 70119 k. Thank you very much in advance.