I have been practicing Auto-mission using Pixhawk, Arducopter firmware and mission planner from quite some time. In the last flight, however, in an attempt to check the failsafe, it was observed that the quad started gaining altitude even after entering the RTL and later LAND mode. The quad started drifting away from the launch site ultimately leading to a crash. A discrepancy was observed in the value of RC3 in and RC3 out channel values also. The logs made on autopilot happen o have stopped abruptly even before the actual crash occurred. The quad was recovered from a place around 300m away from the place where the last entry in the log was found.
We had already performed alt-hold, auto-flight, landing, and RTL checks the previous night and everything were working perfectly fine. The quad automatically went to RTL and landed perfectly when the transmitter was turned off.
My project deadline is approaching soon and I cannot risk another crash.
I am uploading the autopilot log too.
I have no idea what might have caused this crash.