iCloud.com not responding

Over the past few weeks iCloud.com has started to fail with the attached error message. I have tested on Chrome (Windows), IE (Windows) Firefox (Windows) and Safari (Mac). Once it gets into this state nothing will fix it on my end so it appears to be a server issue. The next day the problem will be gone. I use iCloud.com for my calendar, task list and some email. When I need iCloud.com I need it to be reliable, I don't want to wait to the next day.

The details indicate a Javascript call is getting an error trying to read the properties of a null object.

Note: I'm using the iCloud plugin for Outlook. When iCloud.com gets into this state Outlook still works correctly (i.e. I can see my calendar, tasks, edit them, etc.)

Anyone else having this issue?

--Don