This weekend the Amazon api was unavailable to users for a number of hours. The symptoms were that Amazon would not accept any keys via SOAP protocol. Everything seems to have returned to normal on Sunday. If you have any missing products from your cron job running while api was unavailable you can restore those by re-running the cron job (for subscription campaigns) or re-running your standard campaigns. For future reference you can control whether Prosociate deletes unavailable products or marks them “out of stock .”  This is in the settings area.