Sunbeam Royal Luxe Mushroom Heated Blanket - Full

I sleep on top of blanket. Don't like to cover up. Can you feel the wires thru this blanket if you lie on top?

Does the blanket itself feel warm to the touch or do you only feel warmth when under it?

Is there anything I can do if my blanket stops working?

Has anyone tried to use the warranty? Mine hardly heats up at all anymore. Only used a few months.