In both QGC and Solex TX the controller voice consistently reports (about every three minutes) that it has disconnected from the air unit though RSSI remains in tact and everything is as normal.
This was not the case prior to the latest FW update.
Simple as normal android phones.
To access the GPS/airplane mode button, swipe down from the top.
To access the active app list, press the square button at the left-hand-side.