iOS sync with iTunes required all time for Mac/ PC users made some updates on your iPhone/ iPad or iPod Touch. So you can sync iPhone with iTunes over Wi-Fi without Cable or Turn off Auto sync iPhone with iTunes from iTunes. By default this option not enabled, you have to save that. This is good option for some critical situation when you don’t have USB lighting cable or want sync with iTunes. Might be folks affecting problems like poor wifi connectivity, Takes more times compare to Cable, overcame Battery Drain problem or on low battery, not sync songs and other media files completely.
Prerequisite: in both case for Enable or Disable auto sync with iTunes over WiFi you need USB lighting cable.
Steps for Turn off Auto sync iPhone with iTunes running on Mac/ PC
Step 1: Launch iTunes on your Mac or PC/ Laptop. Only For that disable auto sync iOS device.
Step 2: Connect your device with USB lighting cable to your Mac/ PC.
Step 3: Wait for your device will appear in iTunes from top tab, given in below screen.
Step 4: From the left pane select Summery option and click on it.
Unchecked/ Disable Sync iPhone over WiFi
Then, Save setting by Apply button.
Might be you can see this option without connecting USB cable, But not properly in many case. It’s hence that your device connection over Wi-Fi left before registration on your iOS device. So I recommended USB lighting cable connected when you turn off Auto sync iPhone with iTunes from Mac or PC.