iPhone keeps disconnecting from Mac

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.

After trying most of the solutions, multiple cables and ports with no luck. I think the problem might be a connection issue, I mean to say that if there isn't a good connection with all 30 pins this could be the cause of the issue. I resolved the issue by spraying the 30 pin port with electrical contact cleaner. Be careful when trying this solution as I have stuffed up a display by spraying it right next to the phone and the cleaning solution went into the device and ruined the screen. Just spray lightly from a 20 or 30 cm distance just so the solution contacts the 30 pin port. It worked for me and alleviated some major frustration. Good luck !

I'm using an iMAC 27" vintage 2014 and iTunes connects properly both to iPad Pro and iPhone 6: the problem is that the battery charging process in both iMAC USB sockets doesn't seem to be working. I am trying the iPAD pro now through the wall plug and Apple adaptor and new lightning connect and that is charging properly. So, data connection yes, but power connection... it would seem not. Do iMAC USB connections break down, or is there some software problem? Obviously, the lightning cable could be the problem, but I would like to know if there are precedents for the data-si charge-no phenomenon.

I was having this problem but fixed it by going to

Disk Utility > Verify Disk Permissions and then Repair Disk Permissions.

Good luck!

Resetting SMC helped me to overcome this. Resetting the System Management Controller (SMC) on your Mac - Apple Support

Reset the SMC > Intel-based Macs: Resetting the System Management Controller (SMC)

Hi, I have this problem:

-My iPhone connects and disconnects when I connect it to a Macbook Pro 2015, via USB 3.0. But... only in my opened session. When I'm a guest user or before I start my session... it charges well. Connected to the wall it charges perfectly. Why is this happening? Anybody knows? I tried in my Windows Desktop PC and I have no issues, it works perfect. The problem is with the Macbook Pro.

I did every step suggested in this threat without being successful. Yesterday I couldn't connect my iPhone to Macbook. But today morning, the phone could connect... I have no logic explanation, but the same happened before with a temporary solution. So it may happen again, since nobody (not even Apple's service) has an explanation.

I've got to notice that this problem is only when I'm logged in my administrator session in the Macbook Pro. In other systems my iPhone works perfectly: I tried it in Windows Pcs and had no issues. I can charge it in the wall. I also have no issues charging a Samsung Android Device with the Macbook pro!

It seems to be all about the iPhone and the configuration (automatic) of the Macbook.

Good luck everyone.

Device: Macbook Pro 15" Retina mid 2015.

Operative System: MacOS X High Sierra.

Phone: iPhone SE 64GB.