Why is my j7 perx not showing who texted or have preview at top of screen

[Android Central Question]

Usually when I get a text message I hear the notification and it shows from what number the message came from and if it is from a contact it shows which one. It used to also show a preview of the text at the top of the screen. Suddenly it just says new message and I have to click on it to see who the message is from and there is no message preview anymore. It's making me crazy, please help.