Warning! Facebook says your page is engaging in behavior that may be considered bothersome or abusive by users. To avoid messaging restrictions being placed on your Page, Facebook requires you to immediately decrease the rate at which you are sending messages outside the 24-hour window to this person.
Facebook and/or Facebook users consider the messages abusive or bothersome, falling outside of Facebook's policies.
Soften the content of your message and decrease the rate at which messages are being sent to the user outside of the 24-hour session.