"Thanks for the replies, Mark Slater . Here is the .bin file. 195.BIN"

"Here are the log files.2015-08-06 09-01-51.log2015-08-06 09-01-51.log.xml2015-08-06 09-01-51.log.gpx"

"Thanks for the reply, Andre K. Rotated arm will definitely result in uncontrollable YAW behaviour, but it would not "cycle" like it did in my case - it would be continuous. In addition, since I was not far away from the copter, I can safely say,…"

"I am sorry to hear that. I am not using Power Module and the PDB connects to batteries using two EC5 connectors."

"Good day, Hugues. If You replied to RdanielK, then I would like to point out, that he set RX failsafe values to 50% (Roll, Ele, Yaw and Throttle) + CH5 value to RTL. I may be wrong here but You do not have to have Throttle failsafe activated in that…"

"Good day, Hugues. If You replied to RdanielK, then I would like to point out, that he set RX failsafe values to 50% (Roll, Ele, Yaw and Throttle) + CH5 value to RTL. I may be wrong here but You do not have to have Throttle failsafe activated in that…"

"I am using Pixhawk. "

"Hello Gary and thanks for the reply. It is a custom built hex. Yes, the ESC's are soldered directly to the PDB. I did take the whole copter apart and everything is just fine inside - like new. The PDB is 250A rated Vulcan PDB which is also more than…"

"Thanks for the answer. I have not tested 3.2.1 yet. Testing every firmware in hope that it will not happen again is not the most economically efficient way to deal with the problem."

"Thanks for the anwser. Failsafe has been set. Even if it would not have been set, the motors could not have stopped because of that since it was in Loiter at that moment and You can drop throttle % to 0 in Loiter without the motors stopping."

"Is it possible, that Pixhawk shuts itself down mid-flight when the safety button is pressed? Also, will it stop logging after that?"

"Batteries are OK - plenty of power still left (15,2V @ 4S). Two 5000mAh 30C batteries were used in parallel. Haven't said anything about wiring, testing them at this very moment. All ideas of why it could have failed are welcome (not only Arducopter…"

"I've tested the RTL feature with pretty much every Arducopter version of the past 2 years. Yes, I've updated from 3.1.5 to 3.2. "