My Galaxy Tab 4 connects fine to both controllers, but it's running on Android version 4.4.2. I've verified the AC and RCs are all running on firmware version 01.02.01.06. I've reinstalled the DJI Go app on the phone several times and tried various startup procedures to get it to connect to either RC. Anyone having issues with Android version 5.0.1? That's the only thing I can think it would be.