Multi-calendar issues

I have had issues off and on for about 5 months. Solid for 6 weeks, then it worked about 80% of the time for 2-3 months, now it does not work at all.
When I go to the multi-calendar page, I get the 503 ice cream girl.
Airbnb can’t duplicate, but claims they are working on it.
I only have about 33% of my listings active right now. It is really causing havoc with my availability, and I am having to decline guests because I don’t realize the calendar is open without going and looking at each one individually.
I have tried in IE, firefox, chrome, and opera browsers and it fails everywhere.
Has anyone else had this type of multi-calendar issue?