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When my I connect my iPhone 7 to my MacBook Air (2015) with the original Apple USB cable it endlessly alternate between connected and disconnected, i.e. charging and not charging. Thus, the iPhone does not charge and even discharge. How to solve this issue?

Note: cables and connectors are fine. the cable works properly when charging with the power adapter. I also checked with other cables (MFI certified) and on all USB ports of the Mac and the issue is still present.

Also, as far as I remember, I had this issue since my first Apple devices (iPod Touch 2G with MacBook Air 2013) and it affected all my iPhones since (3GS, 4S, 7).

I also want to point out that this issue does not occur each time I plug my iPhone to my Mac but only sometimes and at random moments.

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This issue is pretty old and was previously discussed on Apple forums (here). Here are some solutions that could work, disconnect the iPhone before proceeding:

  • Reboot both devices
  • sudo killall -STOP -c usbd in macOS Terminal
  • Settings > General > reset Location & Privacy on iOS
  • Reset NVRAM/PRAM
  • Delete iPhone USB and Thunderbolt Bridges from System Preferences > Network on macOS
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    ...also it could be a defective cable. Apr 27 at 20:07
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    ...or a dirty Lightning plug (on the cable) or socket (in the iPhone). Apr 27 at 20:36
  • I tested those hypotheses prior to publish this answer. I added details to the post.
    – Louis Lac
    Apr 29 at 11:08
  • But have you tried a known good cable? Over the years I've had several cables which work well on a charger, but are flakey when connected to a computer.
    – IconDaemon
    Apr 29 at 11:13
  • Yes, I tried both an original Apple cable and a (new) MFI cable from a well known manufacturer with high reputation (Belkin). Please, see my updated question. I also want to highlight, as I noted and my answer, that the issue is not new and affect lots of people.
    – Louis Lac
    Apr 29 at 11:16

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