Sometimes, when I am in a suborbital flight over Kerbin, between 90,000m and 110,000m altitudes, the craft starts to rotate faster and faster in no particular direction.
I have only seen this when using the Mk1 Command Pod.
I suspect it starts to happens when I toggle between the map view and the spacecraft view at this altitude.
I will try to find out more about what causes it...
Anyway, thank you for bringing this brilliant game back to Xbox one
EDIT: This is not a bug, this is me unknowingly pressing LB and moving LS, setting a trim.