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Dec 31, 2014 6:30 AM in response to ceaselesschatby Jason L,Hi there ceaselesschat,
Welcome to Apple Support Communities.
The article linked below provides a lot of great troubleshooting tips that can help you resolve the issue with your iPhone 4 disconnecting from your MacBook Pro unexpectedly.
iTunes: Resolve USB-related alerts - Apple Support
Take care,
-Jason
