As per your concern, we would request you to kindly perform the following steps to resolve your issue.
Path: Go to Settings > Sounds and vibration > Notification vibration pattern.
In case the issue still occurs, kindly report the problems with a log file. To share a log file, click on the Samsung Members Application (Open Samsung Members Application > Support> Tap on send feedback> Choose Composer> Select error report> select the appropriate issue category> Type your query and send).
