The board said her utterances were unbecoming, adding that the separation issue was being over stretched.
Tonto had revealed how she caught her ex-husband, Olakunle Churchhill on a red pant, with red candles and laptop at night, describing him as a Yahoo boy and scammer.
She has continued to lash out at critics and those who made jokes about her situation.
Speaking to NewstimesAfrica, Prince Ifeanyi Dike, Chairman, AGN BoT, said: "Tonto Dike is exhibiting bad behavior that we will no longer condone. What she should realize is that every marriage has its own issue. No one's marriage is perfect.
"Issues like that are private. It is very unbecoming of her to portray us in bad light. There are so many actors who have issues with their marriages without getting the public involved. Her actions does not speak well of the industry.
"We are not interested in her private matters; rather we are concerned about her attitude which is rubbing off negatively on other actresses.
"Actions like this portray the industry as having unserious ladies. That is why men are scared of marrying actresses.
"Thank God that we have good examples in the industry. If she is looking for sensation, she should look for something else to use.
"Honestly, the Board of Trustees is not happy with her and if she continues this way, we will sanction her. We do not encourage bad behavior."AD