Hi! I'm experiencing the same "Disconnected" issue, but as I can observed, when I plug the USB, android don't display "how to connect" message. I did a full clean install on the tablet and on the DJI Go settings. I tried with DJI Go 3 and 4 version, with no success.
In my case, I have a P4 connected with a Samsung Galaxy Note 10.1 (N8000) with Android Marshmallow (6.0.1 - Cyanogem CM13). I also tried with Android 5.1, without success. On both case, USB Debugging is enabled and MTP mode is selected for USB.
With my S4 (Galaxy I9505) and Android Marshmallow (6.0.1 - Cyanogem CM13), works perfectly with DJI Go 3, but DJI Go 4 always crash on start.
In my case, I have a P4 connected with a Samsung Galaxy Note 10.1 (N8000) with Android Marshmallow (6.0.1 - Cyanogem CM13). I also tried with Android 5.1, without success. On both case, USB Debugging is enabled and MTP mode is selected for USB.
With my S4 (Galaxy I9505) and Android Marshmallow (6.0.1 - Cyanogem CM13), works perfectly with DJI Go 3, but DJI Go 4 always crash on start.