Hi, Basically 'mounts' just don't disappear. So, the only possible explanation is that some task on your machine umounts your partitions. Now, for the question "what?", I find it just the right time to experiment with systemtap. (I truly hope that Mandriva 2007 already supports it)
So, please find the attached systemtap script. It will probe for the umount system call and will print you the pid and name of the process umounting your partitions as well as the parent's. See where it gets you. - Noam
umount.stap
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