External Drive UNMOUNTING On Its Own...

Hello.
I have a quite-brand new Iomega External Drive FireWire 800 2TB, bought recently to replace my old failed drive, to be a Time Machine Drive for my iMac.
For the past few days I have observed something very very strange: This TM Drive will for no reason, unmount itself from the Desktop; Sometimes I will be at the computer and that usual warning window message about not unmounting your external drive properly will appear. But sometimes when I get back to my iMac, the ext drive has already unmounted, not sure for how long since the icon is not there anymore.
I just have to turn off and on the drive again to get it mounted.
Before this strange thing, there was a couple of times when TM failed to back up, but it was nothing serious, I just back up again and it is fine. There was once prior to this, that I re-format the drive again (GUID partition) and TM all over again.
I ran Disk Utilities and it says the drive is OK and need no repairs.
So what went wrong here? I have doubts that the drive is faulty because I just got it recently as a new replacement to a previous dead drive. Could it be the iMac itself? The OS? Or the physical FW800 port itself?
Need some advice and help, thanks and cheers

Over the last few days, I have noticed this behaviour (external drive unmounting itself), but I have a 2TB Western Digital USB2 My Book Mac Edition drive that has been working fine with Apple's Backup program since I bought the drive exactly one month ago. The Backup files have now half-filled the drive, and when Backup is attempting to save a new file the drive unmounts and the backup fails. Hers is the backup log from Console for the last couple of days (Cassini is the name of the WD external drive):
2010-11-18 11:54:05.080 Backup[22672:8537] debug: unable to test mount disk image {
"image-components" = (
"/Volumes/Cassini/Backups/Phobos - 2010.11.18-00.30.22.847.backXX/Contents/Contents/Backup.sparseimage"
"shadow-file" = "(null)";
"system-entities" = "(null)";
2010-11-18 11:54:05.107 Backup[22672:8b03] unable to gzip /Volumes/Cassini/Backups/Phobos - 2010.11.18-00.30.22.847.backXX/Contents/backup.log: file does not exist
2010-11-19 08:42:53.803 Backup[22672:bb9f] debug: unable to rename disk image {
"image-components" = (
"/Volumes/Cassini/Backups/Phobos - 2010.11.19-07.36.08.399.backXX/Contents/Contents/311805478.972355.sparseimage"
"shadow-file" = "(null)";
"system-entities" = "(null)";
2010-11-19 08:42:53.848 Backup[22672:9e3f] unable to gzip /Volumes/Cassini/Backups/Phobos - 2010.11.19-07.36.08.399.backXX/Contents/backup.log: file does not exist

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