Chosen Solution

I’m not familiar with the Wowee Elvis toy, but at least according to this resource online: https://www.instructables.com/WowWees-El… There is a variable resistor that connects to each motor that controls part of the face, this variable resistor is what determines the home position and how far each part has moved. This part is the same part used in joystick controller knobs (or at least very similar) and they break all the time. What the variable resistor in the toy looks like

What they look like in a controller joystick

My suggestion would be to replace this part or check this part and see if the issue still crops up

Hello, it could be that a controller has been damaged or so if it has been near a source of electrostatic energy it may have been damaged or that a motor is damaged.