APM bouncing?

I have been flying with a Bilxer 1.1 and APM 2.5 for several months with few problems.  I upgraded the motor/ESC and then balanced and recalibrated the accelerometer.  Now when sitting still on the ground the plane is reporting that is it bouncing, the pitch is changing 1-3 degrees up and down constantly but the plane is completely stationary.  The roll and yaw axis seem to be steady and calibrated.  I have calibrated several times but I can't seem to get rid of the bouncing.  I have never seen this before.  Any suggestions?

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  • Normal behavior due to poor GPS fix. I know it sounds strange, but it's true. You can ignore that. It's not a error or bug, just an advanced way of using GPS data.
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