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MélodyH Author

Level 1

106 points

iPhone connects and disconnects from Mac

Hello,

When I plug in my iPhone to my Macbook pro, it repetitively connects and disconnects. Therefore I cannot charge my phone through my computer anymore.

I own this iPhone since decembre 2018, and this issue only appeared this week. However when I plug in my iPhone to a wall outlet, it charges perfectly. I also noticed that there is a lag time before my phone starts charging when connected to my Macbook (before disconnecting right away, and then reconnecting etc).

I tried to connect my iPhone to both USB ports of my Macbook, with many different Apple lightning cables and also my Anker cable (MFI certified), but the issue substains. I plugged in my mother's iPhone 6 to my Macbook and it charged perfectly. I plugged in my iPhone to my brother's former Macbook pro (15" from 2008) and my iPhone could charge normally.

Here everything I tried to resolve this issue (which failed by the way) :

- I shut down and turned on my computer and my phone.

- I reseted location and privacy of my phone (Devices rapidly disconnect/reconnect - Macbook Air Mid 2013).

- I also restored my phone.

Could anyone tell me a solution?

I specify that I have a 256Go iPhone X under IOS 11.2.5 and a 13" retina Macbook pro (mid 2014) under High Sierra 10.13.3.

[Re-Titled by Moderator]

iPhone X, iOS 11.2.5

Posted on Feb 10, 2018 1:34 PM

Top-ranking reply

YashYY

Level 1

23 points

Posted on Nov 1, 2019 5:24 AM

I had the same problem. My computer was a late 2014 iMac 27" 5K. Problem started with my iPhone 6 and persisted after I upgraded to iPhone Xs. Things I had tried:

Restarting many times both iPhone and iMac.
Changing the USB inlet.
Using a different USB cable. The problem would stop for a very short time and then return.
Connecting to my MacBook Pro with the same USB cable. It worked fine. Problem was with iMac.
Force quitting "usbd" from Activity Monitor.
Settings>Network> iphone USB> then uncheck the box that says "Disable unless needed"

None of the above worked. Until I contacted Apple Support today. They prompted me to enter this Terminal code:

sudo killall -STOP -c usbd

Problem stopped immediately. I restarted the iMac and things still work fine. Haven't seen how it turns out long-term, though. Give it a try.

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iPhone connects and disconnects from Mac

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