See also these threads and note the number of complaints and the span of dates:

http://www.google.com/support/forum/p/Google+Apps/thread?tid...

http://www.google.com/support/forum/p/Google+Apps/thread?tid...

http://www.google.com/support/forum/p/Google+Apps/thread?tid...

http://www.google.com/support/forum/p/Google+Apps/thread?tid...

I'm personally having the same problem today, when the auto renewal date is a month away. I've filed two tickets without response. It seems the only solution people have found is to remove their credit card information from Google Checkout.