I built a copter for a friend, who was out flying a mapping mission in auto. Just prior to the last waypoint the chute deployed. After reviewing the logs I cannot determine why the chute deployed. It looks as thought the copter is flying just fine and there is no 20 degree mismatch or manual deployment. Note that the copter is an s900 hexcopter, with a separate battery for chute power. The upside, is that the copter landed with very minor damage from a deployment height of 80m. Skycat chute - the big one. Sadly the logs stop when the chute deployed. The log records the chute event at the very end, but I cannot see an RCOUT that would correspond with the chute deploying. Chute is on ch 8.
Logs here: https://1drv.ms/f/s!AmjTxgL9PMUvk9hoP5LiRujJPUyxBg