There are good days, there are bad days and there are days beyond bad days
ArduCopter V3.2.1 (36b405fb)
Great day for flying, wind 1-2m/s, sunny. The aircraft was flying great until I started coming back to land. It suddenly started yawing (to the right if I remember correctly), then stopped, then yaw again, stopped and yaw again until it hit a tree. I had no control when it was yawing but I was able to control it when it was not yawing (between the yawing "cycles"). It felt like someone was pushing YAW right stick, it did not feel like it was correcting for a motor/ESC etc error. I would also like to point out that all motors were working when it was in the air. I also included a log if someone is able to point out what caused this not so cheap crash. I was not able to determine the error by looking the log file(s).
PS. There was a truck crane operator near me with a crane remote if this is relevant in any way. The crane remote should work @ 433Mhz but I am not sure.