disappearing mounted volumes

[Kevin O'Gorman]

I'm running Xubuntu 14.04.1.  From time to time my mounted volumes become
inaccessable, and any attempt to use them gives an I/O error.  In such
cases, attempts to umount them results in the message that "<mount point>
mount disagrees with the fstab".

On system reboot, without loss of power, everything is okay.

Is anyone else seeing this?  Does anyone have a clue what I might look for?

-- 
Kevin O'Gorman
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