It's Dumbing again!

The other day Tyler brought me a battery-operated toy that was on it's last leg. He was obviously very frustrated and told me "It doesn't work. It's dumb!" I didn't know what was wrong with it, so I turned it back on and handed it back to him. He was ecstatic for three seconds before it turned off again. He started crying and yelled, "Mom! It's dumbing again!!"