Have your wife try unplugging the HDMI cable from the television, see if that clears up your slinging problem.
If it does, your problem is the way HDMI handles it's handshaking and copy protection scheme. The only reasonable way I know of to get around this is to discontinue using HDMI and switch to component cabling.
Here's a related thread that has a little more info. It's not exactly the same problem you're having, but it's similar.
Good luck !