mpu-9150 strange x axis gyro values

By beat , 25 March 2014

Hi
Is there some reason why I would have a much more noisy signal on one gyro axis compared to the other two?
Image removed.
These are raw gyro values. 2000dps full scale.
Blue is X axis.
Internal clock is using Y gyro reference.
Any ideas would be much appreciated.
DLPF is set at 20Hz but it doesn't seem to change the output if i change this.

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