Very cool video!
The video below shows the first "Flight and glide" video I have made post-crash with my Ultra Micro Radian onto my neighbor's roof. The cause is unknown, but after I crashed my UMX Pitts on video the cause seemed similar. I put fresh batteries in my DX6i and I haven't had a problem since with any of my planes.
http://youtu.be/BscaoTsfZSk