I had quite a scare today, I was testing out my quad on auto, I've done this before but this time I added more waypoints and differences in altitude for the waypoints.
Everything was going well but halfway through the auto flight, the quad started to drop in altitude continually up to a point where it reached the ground. Thankfully I was keeping a close eye on it and managed to swap back to stabalise mode before it completely crashed.
The above is a screen shot of the Tlog showing how the altitude started to drop consistently after way point 5. I have attached the full Tlog, the crash happens at around 34%.
I tried troubleshooting it myself and here's what I have concluded thus far:
1. Shouldn't be a GPS problem, GPS status in the logs seem consistent
2. Shouldn't be a battery problem as I flew the exact same route on the same battery after this crash and the quad flew the whole route without incident.
3. Shouldn't be the wind, flew a few times in different wind conditions at different locations and with different batteries, and 1 out of 2 times this would happen at a random location
4. Shouldn't be a receiver failsafe problem as I was able to swap back to stabalise after it clipped the ground and flew it back without issues.
I'm out of ideas and I'm not too familiar with the different tlog values to fully understand the graphs.
My current setup is as follows:
Stock DJI 450 frame, ESCs, motors and 8" props
AMP2 with Sonar, 3DR telemetry, Castle BEC at 5.3V, uBlox GPS, external LEDs
Zippy Compact 3S 3700mah 35C lipos
Please advise thanks in advance!