Your log.txt is being flooded with data from 124thATC, which is NOT GOOD. Although this makes it harder to read the log.txt file, I don't think it is related to your AP disco issue. I don't see anything else obvious in the log.txt file. It's possible something else is interfering with the Saab. I would try removing your 3rd party plugins (except Gizmo, do several test flights, and let us know how it goes. No one else is reporting this as a problem so it must be isolated to your system ( plugins, hardware, etc.) or pilot input.