If you are experiencing software lock ups or your unit freezes the first thing to do is reset the Head Unit by holding down the power button for 10 seconds (MS-RA200) or pressing the reset button inside the face plate (MS-XX600). Then reset your Apple iPhone by powering down and then restart the phone. Reset your iPod (see Apple website for model specific information).This should resume normal operation, then make sure you have the latest version of iTunes and the latest Operating Software in your iPod/iPhone. It is important to update software when Apple release new versions. If you are connected via a Dock ensure you are using the correct sleeves and the connection to the Head Unit is secure.
Check that your Apple product is supported by the Fusion Head Unit.