Rattling inside my geetar.

[Heraclitus]

The slightest movement of my new wireless rockband guitar makes it rattle, like someone stuffed a Googly eye (http://en.wikipedia.org/wiki/Googly_eyes) in there. It works fine but the sound gets very annoying. Should I return it or is there a way to fix it on my own?

[dovanon]

That's probably just the tilt sensor. If the guitar works fine, then you shouldn't worry.

[Chatham]

My RB1 Wii guitars have ALWAYS made this noise... It's extremely annoying.

[m85021]

Dovanon is correct. You're hearing the tilt-sensor.
When you stop hearing that sound is when you should worry.