I continue to get expiration notices for a pro-site with permanent pro-site status.

I've had pro-sites installed for awhile, the problem inexplicably showed up maybe a month ago or less. Just started getting an email every day saying "sorry, your pro-site status has expired on the Chicago site". I re-check the settings and it says it has permanent status. So the site is fine, operational and all, just keep getting these emails everyday saying its not.