I just bought a Sandisk Cruzer Micro 4GB at Best Buy for $40. All good, except for one thing. The retractor works fine, except that there is something rattling if you shake it. I pressed down on the retractor switch and it shaked it and no rattling. I exchanged it 2 times and still does the same thing. Anybody else experience this? I called Sandisk they saw that too. Is it a design change? All my other Cruzer Micro's never rattled. Thanks.