Third flight today and was nearly to be a disaster. I switched on ST-10, then the Q500, connection was established and I took off. Suddenly as it was at about 10 meters height, it did not obey to the commands from ST-10 and no data from battery, gps, position, height was shown on display. I could do nothing except watching it and waiting for the battery to drain and fall down! Then I decided to switch off the ST-10 and on again. Thank God, it established connection! I think something happened with the ST-10. Any ideas?