iPhone connects and disconnects from Mac

I've had this problem for ages and finally found a solution.

On my iMac I went to - System Preferences - Network - iPhone

step1. untick disable unless needed

step 2. press on Set Up Bluetooth Tethering and turn bluetooth OFF.

Finally press apply.

Hope this works for you!

I have a Mid 2015 Macbook pro 15 inch and had so many problems with my iphone continually connecting and disconnecting This "sudo killall -STOP -c usbd" works and I use it every time I use image capture.

Thank you!

I had the same issue. My phone keeps beeping and my internet doesn't work on macbook air. I don't have iphone usb either on my network setting.

I solve my problem by following this video. https://www.youtube.com/watch?v=Trl0kmxxRRc

One work around I've done is use a USB to Thunderbolt adapter so that I can connect my iPhone to my computer via thunderbolt. Still having this issue after trying some of the methods below. This workaround has helped, but wonder what the solution is w/out an adapter.

Hi, I was trying to do this command but it seems to ask for the older users password for my Mac. (I bought this second hand) I dont have a way to contact him anymore. Is there another way to fix this? Thank you

This was one of my struggles and I searched several times for an answer. One comment was finally correct! It’s because the battery is too low! If my phone was under 50% then it would essentially freak out and keep connecting and disconnecting instantly. I think it’s because it was struggling to charge and connect to the iMac. So after it’s charged to a good amount, mine does not do it anymore. I hope this helps other frustrated people solve it. 🤞🏻❤️

I FIGURED IT OUT - so I have a 2015 MacBook Pro and an iPhone 11 Pro Max. Both USB ports gave me the rapid disconnect/connect, and was so frustrating. Tried EVERYTHING - reformat everything, reset everything, BUY A NEW IPHONE, yet nothing worked. THen work gave me a new iPhone SE and it didn't have an issue.

So I thought, maybe it's to do with the power draw/output on the USB port vs a powerful iPhone!

So I got a Ethernet USB adapter that has a USB port on it, and plugged my iPhone it that way.

IT WORKED - no more rapid disconnecting! So it's not an elegant solution because Apple are Apple and we love dongles. But at least I can finally backup and sync my iPhone!

Next problem to sort out: Album Art and songs repeating the last 30s!

Hi Sergey...!!! Even now in 2021, is the same for me and my brand new 2nd gen iPhone SE. The above 60% battery solution worked for me as well.

Thank you very much!

Carlos

P.D. I'm running MacOS Mojave (ver. 10.14.6)

Someone had this answer above but it wasn't explained well so like most of you I scrolled by. I tried in this thread and it didn't work. But this did! Open the Terminal app from Spotlight (Command+ Space) and enter the command sudo killall -STOP -c usbd

Yeah, it's that easy.

This will pause the usbd process. Now, connect the USB cable and check if the iPhone is still charging on and off rapidly.

I've had this problem for YEARS. I'm so glad it's fixed!

Thanks, this works, but the problem reoccurs.

It may be related to the Anker brand cable as someone else mentioned using that here, and I used that brand, then switched to apple cord.

Will bookmark this for future use.

Same with iPhone 12 mini (15.0) on M1 Mac (11.6).

Intermittently disconnects from Finder and Image Capture, sometimes mid-sync.

Important:

• works fine on an old MacBook Air with macOS Catalina, same cables.

• other iPhones / iPads all work fine on the M1 Mac Mini with the same cables.

• tried different cables (USB, USB-C) and ports

• only original Apple cables, undamaged

• tried without USB hub

• tried rebooting all devices

• tried resetting the privacy / location settings on iOS, trust computer again.

• tried killing the usbd process

• tried creating a new user on the Mac

In System Preferences -> Network I found a couple of Thunderbolt bridges and "iPhone USB" devices that all had red or orange indicators. I deleted them all an now it seems to work.

This worked for me (going to network in system preferences on computer, click on iphone usb, uncheck box that says disable when needed) when nothing else did. iphone xs max with ios 15 connected to 2015 macbook pro 15 inch running big sur 11.5.1

For the last year nothing else corrected the rapid on/off when phone was connected via usb to computer. This fixed it.

Thats true, #AppleCare doesn't seem to care at all, every supposed trick here is just guess work and not an actual solution, people tried their best to resolve among themselves, meanwhile the apple admin idiot who manages this thread probably doesn;t even open this page to actually try and give an f...! All while launching new crap non stop...

I had the same problem with similar hardware: Mac book air 13-inch 2017 and iPhone XS.

None of the software tricks helped. However cleaning the magsafe connecter female solved the problem. Seems to have been an electrical / equipment grounding problem.

I was having the same problem but I solved it by using another cable. The way you connect your phone to computer matters too. You should connect the cable to the computer first before connecting your phone on the other end.

I hope that helps.