I bank with Chase and I received a message from them via Chase.com at least 10 days in advance warning us about this scheduled maintenance. I deleted the message so I cannot repeat it verbatim -- but it went along the lines of telling us what hours they would be performing scheduled maintenance, please be sure to get any information for your tax needs beforehand, etc.

It is unfortunate the way that their scheduled maintenace falls, but it is necessary and they did warn users well in advance.