This is a really weird one. It has happened to me once, when I traveled to Thailand, but not when I've traveled to Mexico, Brazil, Singapore, China, Belgium, o

This is a really weird one. It has happened to me once, when I traveled to Thailand, but not when I've traveled to Mexico, Brazil, Singapore, China, Belgium, or anywhere else in the last couple of years. In all of those instances, I had other devices (tablet, Chromebook, laptop) at home that were still logged into sessions with the same account. It would be handy to know how they decide when to flag accounts. Facebook, too, for that matter, and Paypal, who seem to be the most draconian.