Motors spin after arm.

After searching in various forums and in the documentation without finding the cause of the problem I thought to throw a question to see if anyone has come across this case.

I have a board APM 2.0 with software 3.0.1 and sometimes ArduCopter after connecting the battery and assemble the engines, they start spinning for a few seconds (fortunately I have not mounted the propellers). It has happened both with connection to Mission Planner as without it. Not if the rotational speed is suciciente as to lift the Quadricopter of control.

Anyone know the cause or know how to prevent this from happening.

Thanks for the help.

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