The biggest problem with this copter is that he is using a flight controler made for small quads and hexacopters. The Naza M controller should never be used on a large octocopter. Also the GPS antena is way to close to the batteries. This copter and gimbal would price out around $4000 or less as it looks like every cheap component on the market has been used. Who ever built the copter they definitely should have not have cheaped out on the flight controler. Another thing to note is that there are way to many pilots these days that depend on GPS to fly. GPS assisted flying dose not make you a pilot. May as well just use your iPad to fly the thing and we would all be safer. Though if you drop satellites your forced into manual mode which is probably what happened here. This industry needs comparable pilots who have the reflexes and orientation control to keep these copters under control in harry situations. I have come across so many pilots who have never flown anything in there life and feel they can start shooting cinematic footage with only weeks or months of GPS assisted flying with a drone. Stick with your day job your not needed in this industry.