Wi-Fi sync has stopped automatically starting when I plug my phone into charge. The only way I can initiate a Wi-Fi sync is from iTunes manually. I'm not sure if it's an iPhone 5 issue or an iOS 6 issue. Anybody else having the same problem?
This has NEVER worked for me. Not on my iPhone 4S running iOS 5.1.1 and not on my iPhone 5 running iOS 6.
This has never worked for me either. I tried for a long time to make it work, but eventually just gave up, turned it off, and went back to using the USB cable.
Do you have Do Not Disturb active? I have noticed that if you have DND active and you then plug your phone or ipad into charge, icloud backup does not work. I assume that wifi sync has the same issue. Sounds like bad coding somewhere in ios to me.