Hopefully someone has an answer. Yesterday while flying my Spark using the Crystalsky 5.5" the screen went blank and I believe the message said Go4 shutting down, do you want to re-boot? I said OK, it rebooted and everything went back to normal. The Spark was approximately 20' off the ground at a distance of less than 100'. During the time of re-booting I had control of the Spark with the controller. Any idea what happened. Thanks