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iPhone connects and disconnects all the time, it won't sync.
My iPhone sometimes disconnects when I connect it and repeat this action over and over, like you plug in a USB stick and then disconnect it, and connect it again (but then all the time). It drives me crazy. It works when I put the iphone in the normal charger and then I try to connect it again with my mac.
I’m sad
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Inappropriate?I had the same problem ... turned on Tethering, after setting up the tethering service with my phone company ... same problem .. but ... I noticed that if I turn blue tooth off and then on again on the iphone, it works when connecting from the Mac -
Inappropriate?I think I found the problem.
It's related to iPhone power requirements and USB port power capacity. It's clear the iPhone needs its good power quota from the USB port for charging. If the USB port it's connected to doesn't meet its power requirements, this disconnection issue could arise. It's quite understandable. If minimum current is not delivered, voltage will drop a bit and that would affect the connection, resulting in the phone getting disconnected.
USB ports should have enough power for the iPhone. Apple would not sell millions of devices that could not charge and connect with the port they say it should. So I think the issue is related mainly to power supply quality. USB ports feed from the 5V rail. If that rail is not powerful enough to satisfy every device sucking power from it, it will drop. Right now, my system shows 4.68V on the 5V rail. Ok, internal mobo voltage meters are not extremely precise, but they do the job showing that real voltage is below the 5V mark. So replacing my power supply unit should do the trick.
Another solution is buying a self-powered USB hub. This hubs offer USB ports fed using it's own power supply, so any demanding device should not affect system power supply, therefore not showing any issue.
A last resource could be a USB Y-cable. I've seen one of these on a website a couple of days ago. They have two male connectors on one end and one female on the other. You then plug both males in two USB ports at your computer, having twice the power of a single USB port, allowing the iPhone to have it's needed drink of power. However, if 5V rail is low, no matter how many ports you join for more juice, the signals will have problem since they are interpreted by voltage rather than current.
My two cents.
I’m confident
