After having an awsome week of FPV using waypoints and such, today has been a disaster. My first flight this morning started normal tesing all controls, only when I went into FBW mode, the plane became unresponsive to all controls, and began steadily descending until it crashed into the top of some trees. I tried putting it into manual mode with no response and also tried RTL with no response. So, I repaired the plane and got it back to flying capable. Based on the descending I saw on the first flight, I figured the calibration was off on pitch, so I ensured that I had a slight upward pitch on startup for the second flight. Upon getting in the air, again, I go through all my controls and modes to make sure they are working properly. She responds like she should and RTL was great. I go on to fly and approximately 2 minutes into it, it locks out once again and begins to descend and into a dive this time. I pulled back on the elevator with no response. Being below the RTL ceiling, I engaged RTL, and still no response. Into the very top of a really REALLY tall tree it went. After 4 hours of trying to get it out, I have finally downloaded the logs. Not knowing exactly what Im looking at, I am hoping someone could take a look and possibly tell me what happened. I would have said it was an RC signal loss, however I am using Dragon Link and failsafes are set to RTL which have been tested time and time again before I do long range flights. So if anyone has any ideas, let me know. No updates or changes all week and have had many successful flights until today.
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Without looking at the logs I could probably say this was probably caused by the servos pulling too much power from the board and causing a brownout, or at least thats how the symptoms would suggest to me? How are you powering the APM and your servos? do you have two separate supplies or just one?