Some issue has popped up a few times now where it all starts up fine, but in a few minutes the screen suddenly says "Disconnected" and the Green power LED on the RC goes dark while the other four are still white and lit.  The focus wheel blue LED goes out as well.

Firmware bug?  It was set on the 5.4 GHZ frequency so maybe that?

Please help us to confirm if the mobile device is charging when this issue happens, thanks,