iTunes does not find my iPhone or iPad on wifi
I am constantly having problems syncing my iPhone or iPad to iTunes. Somedays it works fine and other days iTunes does not even know I have any other devices...... very very very irritating. What can I do to resolve this? I have rebooted all machines. I have synced with a cable. Once back on wifi woooops device gone no sync no find iTunes does not even want to know about this device no more.....
iOS 8.1.3
iTunes 12.1
iPhone 6
iPad 3
MacBook Pro with Retina display, OS X Yosemite (10.10)