Vibration and Arducopter 3.1.2 auto motor shutdown (and apm reset?)

Hi,

I have a HK H4 quad with 13" props, AfroESCs, 640kv motors and 4s 5000mah, APM2.6+ ublox.

When I maidened the rig a couple of months ago, it went initially well except for a disaster where one of the plastic props disintegrated mid-air.. had to rep

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