[QUOTE=une]in, but you really aren't and have to sign in again.
Once you sign in, I have never been asked to sign again during the same session.
QUOTE]

Happens to me all the time. Particularly when I go from one function to another; like from checking current reservations to making new reservations or from checking my Rewards account to making reservations. I sign in. I check and fool around with current reservations, I then go to make a new reservation and half way through the process I find I'm no longer signed in. Quite aggravating because it's an obvious fault in the software.