WPMU Analytics and Google usage limits

Hi,

The plugin WPMU Analytics works fine, except very often i get the message: "Error loading data. usageLimitsuserRateLimitExceededUnregUser Rate Limit Exceeded. Please sign uphttps://code.google.com/apis/console"

Obviously this is related to the API limits from Google. Why do i get this error, although my site is fairly simple and small, and how to solve this?

Thanks