Expired Sites Down--PHP ERROR

Several of my pro-sites subscribers have experienced their sites going down due to their credit cards expiring (expiration date). Instead of being able to log in and submit new credit card information, their sites are completely inaccessible. This is happening on several of my sites over the last week or so. See here for a site with this issue: yesco.com/shreveport

Thanks,
Amanda

PS: Upon further investigation, I discovered that Pro-Sites lost our Strip API key settings again; this is the 5th time this has happened; Pro-Sites will begin to misbehave, and when we look, we discover that the plugin has dumped the API settings. Please assist as soon as you possibly can.