When my B4i has an app source open and the iphone (4 v 7.1.2, 5s 10.1 beta) will randomly disconnect and then try to reconnect, sometimes successful / sometimes not. There is a fresh compile of the bridge app on the device.
Sometimes the disconnect happens during an execution and the app and bridge on the phone needs to be forced closed.
For a quick test, I open and android source and connected a tablet. While the iphone was having issues, the tablet was not.
B4i:2.80
B4a:6.30
Host is Windows 10 Anniversary / pro
Java jdk1.8.0_65 on both