Nikon has released firmware updates for the Nikon D3400 and the Nikon D5600, both of which have received a very small improvement that addresses the same bug: "Fixed an issue that resulted in unreliable connections between the camera and the iOS 10.2 version of the SnapBridge app."

The Nikon D3400 firmware is updated to version 1.11 and is available here; the Nikon D5600 firmware is updated to version 1.01 and is available here.

Via: NikonRumors