Nexus Tablet HUD does not respond

3DR Radio V2

I’ve set up the 3DR radio V2. The Nexus 7 tablet voice says, “Connected”, when I hit connect in the “DroidPlanner” app.

However, the tablet HUD never becomes live, and the tablet intermittently says, “Disconnected” w/o any changes or inputs from me.

Any thoughts? Thanks!

USB cable connected?
Which version of Droidplanner?