Slave Ipad controller lost master connection. Second controller set as slave on Ipad mini 3, but no longer has connection to Master, (sort of). Slave controller still can control gimbal, but does not display any information from Master controller such as video, camera settings, other on screen information, and can not change any settings. Also, the the camera app says there is no connection, Master RC list does not display on slave controller, and Slave controller has blue light for good connection. We have tried different usb cables, different ipads, reinstalling app. In addition, we have tried to change the slave controller to master, but not luck. Any ideas what the problem is?