I have a few solid hours flying my Vario in Auto missions and have not had any real issues. Today however, once RTL was engaged at the end of a test mission the helicopter went into what I am calling a seizure! The heli oscillated in pitch and roll very rapidly, it was frightening. I switched to Loiter and nothing changed, then switched to Stabilize and the oscillation stopped. I brought the heli down for a landing but before I landed I switched back to Loiter to see how it would behave, and it was fine. After this I was able to do two more successful Auto flights using the exact same mission. I looked at the log and I can see the "seizure" in the graphs but I do not see anything that would have caused it.
If anyone can review the log and lead me into a better understanding of what happened, I would greatly appreciate it!