Hi Maclin,
This is not an usual procedure. The /etc/fstab should be "system edited" only on installation. As you are talking, some startup procedure are improperly changing your fstab. I would suggest you to look at the startup scripts which are in the "/etc/rc.d/init.d" to determine if anyone is referring to "fstab". For example,
Code:
cd /etc/rc.d/init.d
grep -l fstab *
If any filename appears, edit it to see if it is editing the fstab. Also verify if "/etc/fstab" is a real file or it is a link to another, by entering