Mine comes and goes. It went through a period of time a while back where I was having to sign-in every day, then after some work was done on the website for other reasons, it went a long time without me having to sign-in every day. And, now, it's back to having to sign-in everyday. I have not changed any of those settings, and don't have anything set up to delete cookies. I am using Internet Explorer, 2-year old version.