When trying to sign in to my account only get the following error message?

Unable to Sign In

We're sorry. We are unable to display your account information online at this time. Please try again later. Thank you for your patience.

How often the website is up and running nowadays anyway? I was trying to make a second reservation for the year (been too busy staying with Hyatt and SPG - more than 100 stays so far for the year) and seems that Marriott won't get the business this weekend either.