I strongly suspect that Stamper's suggestion is relevant.
Once recently I made use of a piece of software that was supposed to "optimize" my PC, and I didn't check carefully enough to see what it was intending to do, and as a result every website in which I have "permanent" logins, including LuLa, suddenly forgot I was logged in, so I have had to re-login to several and indicate all over again that the site should "remember me."
-Eric