If your Uconnect system keeps randomly asking for a mass storage device or other random request prompts then you will need to apply the update that is found at the link below:
Here's the instructions for the Uconnect update.
***Important note: Please make sure that the vehicle battery power is not interrupted. This could cause damage to the update and the module. The best procedure is to have the vehicle running during the process.*****
You will need a thumb drive of at least 1GB. If you have files on the thumb drive, please delete them and format the drive (to FAT32) just to make sure that it is completely clean
Download it to the thumb drive that has no other files on it. Once it is downloaded to the thumb drive, please rename it so the file is uconnect.upd (basically delete everything up to Uconnect.upd).
Turn the radio on, Place the thumb drive in the center console USB connector (on vehicles with the dealer installed unit, it should be in the glove box), press and hold the Uconnect button for about 12 - 15 seconds, you should here "update started". This process should take about 15 - 20 minutes; there will be some beeps during the process. Please listen during the update for any error message that may be said by Uconnect. When the update is completed, the radio screen will go back to a radio display. Let me know how this works out for you.