m0useanswered grow question 9 months ago They seem to be triggered when the roots are under stress, but also seen autos stay in veg for like 8 weeks in a air-pot. so its not always true and depends on the strain a lot of the time.
They say over feeding can trip them, excess heat or over/under watering and it all is affecting the roots. so IDK. It seems to suggest something root based but I don;t know how straight forward it is. Need a university to study it and try and get them to find a reason why.
Till then,
Best Of Luck!