My phone is set to vibrate mode. I have set notification reminder 5mins (settings>my device>accessibility>notification reminder>reminder interval 5 mins) so whenever I have any uncleared notifications in the notifications panel, the phone will vibrate every 5mins until I clear the notifications. Everything works fine when I did not have an external micro sd card inside the phone. If I put in a external micro sd card (kingston 32GB) into the phone, the phone will vibrate every 5mins as if there is an unread notification, but there is no unread notification at all. It seems like there is a "hidden notification" or something that the sd card cause the vibrate notification. How can I solve the problem? My phone is Samsung S4, not rooted. Thanks.