I have a male cat, Butters, that is about 7 months old that has been neutered. Lately he has been chewing up a lot of stuff. It started with the blinds in my kitchen and computer room. Just last week he chewed apart the cable on the joystick to my playstation. This week he chewed apart the cord to my cell phone recharger while it was plugged in. He seems to do these things when no one is home and I am scared that one day he will be killed by electric shock. What does this all mean and how can I get him to stop?