Since I bought the N900 years ago I haven't ever feel the need to restart the status menu. Why are you doing that?

When the Yappari applet is loaded its mode is always hidden. Only the Yappari application can make it show itself. If you restart the status menu, you'd have to run Yappari again (so the main window appears), go to the menu, press Quit, and then run it again. You don't need to kill it, thought that works too.

You should never restart your status menu. If you're doing it often, then you have an application that's faulty, locate it and uninstall it.