Arducopter "bucks" wildly from time-to-time

Hopefully someone here can shed some light on what might be going on here.  Occasionally when I am flying my Arducopter, it "bucks" wildly and then settles down again.  It is as if one or two of the motors speed up quickly and then slow down.

Is this an ESC issue?  A battery issue?  An issue with the Arduino?

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  • You didn't say what radio gear you are using.

    If it's Futaba check out the thread 'motor glitch's in flight'

    I personally don't use ANY connectors on the motor side, even the signal and earth from the ESC are soldered to the PDB.

  • Developer

    Are you using bullet connectors from the ESCs to the motors?

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