It happens to me on every flight with the FBW A320 due to the DISCONTINUITIES (you may see them on the MCDU and on Nav Display. My solution if to do a DIR TO the next way point and then I’m back on track.
On the Asobo A320, arriving to some airports you may loose the track due to a bug nearby the end of the Star and the Arrival .In these cases the plane starts circling around .This issue has been discussed in this forum with plenty of posts.
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