Hi Eddie!
Do you happen to have a Flight Data Log from this flight? We would like to evaluate the autopilot performance data from the flight to see what happened. You can send it to us directly at G3Xpert@Garmin.com.
The bulletin we recently issued was resolved with software update v9.12 for GDU 4XX displays. This can be downloaded here: https://support.garmin.com/en-US/?pa...0&tab=software
Thanks,
Justin