I updated the software on my GS165, then P70R, ACU and EVO2. I completed the MFD updates (17.45), as well the related A/P Updates. I also completed a recalibration of the A/P. Now, the Heading Sensor initially retains the adjustment for about five minutes, but then goes askew to being off by 40 deg. I have reset this several times with the same outcome.
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