It may not be that at all.
See Mike's comments here: https://www.geni.com/discussions/272940?msg=1670615
Private User - you might go to that other discussion, tag Mike (which one does most reliably by copying and pasting the URL) mention you were required to change your password twice in the same day, and ask him if he has any idea why.
Feel free to mention what you had been thinking as a result or not, as you choose.