I have owned my Q500 4k since November of 2015. It has unexpectedly fallen to the ground about six times between then and now. The first five times it was low and no damage was caused. However, last week it fell from about the height of my house and the gimbal mount broke along with one landing strut and the camera lens protector came off. Yuneec Tech Support said they have not heard of this problem and they thought I might have a bad battery. This problem has occurred with both of my batteries. I returned my drone to Yuneec for repair. Two months out of warranty. They say repair will be at my expense. Has anyone else had this problem? When the drone falls it is totally unresponsive to the ST10+ controls. Final note: I live at 8,700 feet and the high altitude props from Aeronaut were installed. Here's a link to a video clip of one of the descents.