iPhone disconnecting on macOS

February 25, 2020

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I am using a MacBook Pro (Retina, 15-inch, Mid 2015), macOS 10.15.3, and an iPhone Xs.

This is a fix for when an iPhone connected to a Mac over USB is not recognized properly and rapidly connects and disconnects.

Run a terminal command

Applications - Utilities - Terminal

Open Terminal from the path above.

Enter the following command in Terminal.

% sudo killall -STOP -c usbd

At the password prompt, enter your macOS user password.
(The password is not shown on screen, so type it and press Enter.)

buffashe@buffashe-MacBook-Pro ~ % sudo killall -STOP -c usbd
Password:

Last updated on May 2, 2026