My Samsung M300 phone (Sprint) suddenly started vibrating continuously?

Right after I sent a text message. Have restarted several times. Have removed and replace battery. Checked to make sure that vibrate is not a setting for receiving calls or texts. Problem remains. Any ideas? Is the phone likely needing to be replaced? I'm going to the Sprint store tomorrow but would love to avoid that if possible! Thanks for any help.
ha ha no adult apps (or any other for that matter) have been downloaded.
 
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