Intense weaving started to happen suddenly

Guys,

I am puzzled by a very strange behaviour of APM on my SKywalker. The setup was perfectly tuned and I had done several photomapping grids. All settings were fine tuned and the turns were all smooth sharp and with no weaving.

The same setup, one day suddenly gave wierd performance. The airplane went strait to waypoint #1 and then the waypoint 2 was 11km ahead and the plane started weaving . So much so that it made some circles ! I got the plane to FBW control and brought it back. thinkign there was some hardware problem or a control surface issue. But everything on plane was perfect ! 

I can psot the full log file here, but here are 2 screenshots.

Could it be that if the waypoints are too far apart it can cause in weaving ? 

bad_compass_health.PNG

weaving.PNG

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