iPhone keeps disconnecting from Mac

I blew as hard as I could for several times into the USB end of my iPad cable and it worked! I thought of this idea because of the amount of dust in my office. I thought it was causing a poor connection. It did it! Hope your case is the same

The only way that worked with me was to plug the usb cord slowly before reaching the edge of my laptop, when the phone connects I stopped and it worked perfectly. Once I push the usb cord to the end the phone returns to the rapid disconnection.

Hope that helps!

Just charge your phone till green which is about 20% or more, try again connect to your Mac. There's one guy suggesting this idea and I did so. It worked for both USB ports. Why does my iPad keeps connecting and disconnecting from the new late 2013 iMac

The solution is as follows:

1. (Make a backup)
2. Shutdown
3. Connect your macbook with power (otherwise this won't work)
4. SMC-reset (power management)
   1. Hold for 15 seconds: cmd + alt + shift + power
   2. If you have a MacBook with a magsafe adapter thats fully charged you will see the light change from green to orange for less than a second this means the reset has succeeded.
5. VRAM reset (also known as PRAM reset if I'am not mistaken)

   Power on and immediately pres and hold: cmd + alt + p + r. This wil restart the machine, hold these buttons until the machine has tried to bootup two or three times then let go.

The problem could comeback but just use this 2 minute trick and your good to go.

Please let me know of this worked for you!

My hardware: MacBook Pro 15 inch 2015 (fully spect). Had this problem with: iPad 2017, Iphone 7+, Ipad 4, Iphone 6. All works well after this reset.

I know this is an old thread, but hoping I can help someone. Not a perfect fix, but I was able to connect using a USB hub that we had purchased for our PS3. I've tried all of the other suggestions, and nothing worked. If all else fails, try using a USB hub.

Nailed it (well for me anyway). Working on what has been said about current draw I turned the backlight right down and went into airplane mode. Works fine now.

MBP(R) 13" and Ipad Pro 9.7.

Hope thats helps

Want to share my experience too. I got the same problem before for my iMac and my iPhone 6s Plus. I tried all the method like change some setting in my phone and iMac, change different cable but still not my case. At the end I used Isopropyl Alcohol clean all of the connect point of the usb cable and the usb port in my iMac as well. After that everything back to normal.

Turning on airplane mode did it for me.

And after successfully connected my iPhone to the Mac (or iTunes) with airplane mode 'ON', I can turn 'OFF' the airplane mode without having the rapid connect-disconnect got triggered.

After that I can connect-disconnect my iPhone without having the need to turn 'ON' the airplane mode again.

Weird, but it happened to me.

Ipad Air 2 as well as iPhone SE on latest MacBook Air 13" disconnect/reconnect all the time. I turned off bluetooth and they are both charging now. (After have rebuilt permissions and done all the other suggestions here, of which none worked for me.) So this is more like the airplane mode solution. I suppose (pulsing) the (bluetooth and maybe more) network interfaces influences USB power too. I really needed the wired connection because Astropad can't connect wirelessly anymore after last Sierra update (Duet won't connect at all...)

Really?

After the airplane solution as above, I have never experienced the same again.

Oh and additionally, the next two days after getting my wired connection back to work, I updated my iPhone into the latest public beta available.

The reason for the update to beta (yeah buggy but working) is that my iPad Pro did not experience any of the wired connection, and it was on the latest public beta, while my iPhone was on the latest official release.

After the update to this day it has never occurred to me anymore.

Hmm... didn't last long. The next day both devices went back to disco/reco. Maybe I should opt for the public beta update. Really need the iPad as extra monitor/mini Cintiq on the road again for light traveling. Will look for a chance to update and see how far I get.

I've encountered this problem when I was developing my iOS app in Xcode and was going to make a new build. Tried to connect my iPad - it connected for a millisecond then disconnected. I've changed ports, rebooted iPad, nothing helped. And then I've turned off iPhone simulator that was launched from Xcode on my mac. After that iPad connected instantly. Wonder why simulator prevented my iPad connection :/

This worked for me. Thank you!

Le Thuc Minh Tien wrote:

i have same issue but i find the way to fix it. Try this:

tap Settings > General > Reset > Reset Location & Privacy. This will also reset your location and privacy settings. You can also untrust all computers by tapping Settings > General > Reset > Reset Network Settings on the ipad/iphone

hope you fix it!!

This actually worked. I can't believe it.
I tried multiple first party and third party cables. Everything worked fine with all my power adaptors and with my desktop PC. But when I connected my iPad Air 2 or iPhone SE to my MacBook Pro 15" 2015 it would just constantly connect and disconnect.

But, after your advice I tried pushing hard on the USB cable when connecting it, and then it worked as normal.

Every other USB peripherals I've used with this machine, including mice keyboards, flash drives, hard drives, and more have all worked without issue.

This is a really odd problem, and I can't imagine what is causing it.

I had this same issue for months. I noticed recently that it's been a while that my iTunes in macbook pro mid-15 retina has been asking me to update that. And i was ignoring.
I updated that and connected my iPhone with the macbook and its' been working fine since then.