Has anyone found issues with their external SD Card mounting and unmounting on its own? On my wifes S3 it does it all the time which causes issues for custom ringtones that she has set for people as they are stored on her external card. When it unmounts it sets all the custom choices back to use the default ringtone and when it mounts again she has to go in and reset everyone back to how she had it. We are on the verge of exchanging it for a new one since we have only had it for a few weeks now, but I wanted to see if others saw this happening first.