Some sounds not working

[MusicEd2002]

For about two or three weeks now the text notification sound and vibration have not been working all the time on my phone. If the phone is restarted they work for a while then quit again. Today the email notification sound and vibration has quit working also. Again they will work for a while after a reboot of the phone. These are the only sounds not working. Anyone have any idea(s) what might be causing this??? What would be better is a fix. Thanks for any and all help.