Disc unmounts and verify/repair fail

I erased external hardrive because backups kept failing. Then I got 4 good backups and then the disc unmounted itself (won't remount) and now I get this when trying to repair:
Verifying volume “Time Bandit”
Checking Journaled HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid node structure
Volume check failed.
Error: Filesystem verify or repair failed.
I really don't want to erase and start over several times a day! Anyone else with this?
Message was edited by: mwachel

No one else has seen something like this?
Now, I have erased the external drive and gone back to using my old backup software (Chronosync). The external drive is working great so I don't think that is the problem.

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