I have an electrical question. We got a kitchen remodel done back in September. The last 2 days I've been hearing a tapping sound behind the outlet that was put in when I use my toaster. I unplugged the toaster and moved it to the other side of the kitchen and it still tapped behind the outlet/wall for about 15 minutes then stopped. This has only been happening for the last 2-3 days. Do you think the toaster is causing it? The guy came by tonight and took the outlet out and said all the wires look fine. What do you think it could be?