Gimbel unfortunately often with errors

We have appointed a gimbal, and found after a short time that he has the following problem:
In turn (jaw) the copter, the horizon tends to skew and is only slowly back into the horizontal position. After looking around the problem seems to occur more often, and results from a defective IMU.
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After the Gimbal to Amzon was sent back, and bought a new, which unfortunately has the same mistake again. This error of Gimbal is only partially usable.