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After starting XamarinStudio > Start Debugging I received following output:
Please ensure your device is connected...
error MT0000: Unexpected error - Please file a bug report at http://bugzilla.xamarin.com
MonoTouch.MobileDevice.MobileDeviceException: Device is invalid (0xe8000084)
at MonoTouch.Installation.Device.Connect () <0x0007b>
at MonoTouch.Installation.Installer/<ExecuteWithSession>c__AnonStorey15.<>m__15 (object,System.EventArgs) <0x00017>
at MonoTouch.Installation.Device.NotificationCallback (MonoTouch.MobileDevice.am_device_notification_callback_info&) <0x00075>
at (wrapper native-to-managed) MonoTouch.Installation.Device.NotificationCallback (MonoTouch.MobileDevice.am_device_notification_callback_info&) <0x0005b>
at (wrapper managed-to-native) MonoMac.CoreFoundation.CFRunLoop.CFRunLoopRun () <0x00003>
at MonoMac.CoreFoundation.CFRunLoop.Run () <0x0000b>
at MonoTouch.Installation.Installer.ExecuteWithSession (string,MonoTouch.Installation.Installer/Executor) <0x000d7>
at MonoTouch.Installation.Installer.KillApplication (string,string) <0x00063>
at MTouch.Main2 (string) <0x028e3>
at MTouch.Main (string) <0x00017>
I did not manage to replicate bug and it happened only once.
Most probable reason: user connects device too late.
Apple Developer Tools
Xcode 4.6.2 (2067.2)
Version: 188.8.131.52 (Trial Edition)
Build date: 2013-13-05 14:44:13-0400
If it's not reproducible it's not much we can do until it shows up again (and I've never seen this particular error message before).
Most likely it is as you say: an intermittent connection problem between the mac and the device.