External hard drives get improperly unmounted

I recently upgraded to Mavericks (clean install) on my mid 2011 MacMini.  I have an external hard drive connected via USB3 to eSATA cable.  I leave the computer on around the clock as iTunes serves my AppleTV with it's music and videos.
I've repeatedly come back to my computer to find a message stating that my hard drive had been "improperly unmounted" and when I plug the drive back in it won't mount.  Disk Utility reports that there are invalid b-tree nodes and the disc can't be repaired.  I manage to get the disc fixed using DiskWarrior 4.4 (version 4.1.1 couldn't fix it).
I've read that it's an issue with the energy saver program, so I've turned that all off so the computer does not go to sleep and the drives do not get put to sleep whenever possible.  And the hard drive is still getting booted off.
What is going on?  I've taken to removing my drives when the computer is not in use, but that's usually when I run my time machine backups, so now those aren't getting done.
What's the solution?

Hello Ari,
USB3 is prone to interference from Wifi & Blutooth for one thing.
Another... are the external drive(s) ıus powered or do they have their own AC power?
Can happen on earler one's also, but...
See if it's related to this...
The 2012 macs (and later apparently) not waking normally from sleep after hours being in sleep. (noted here ...
http://www.xlr8yourmac.com/archives/feb13/022813.html#2012macswontwake
"Why 2012 iMac/2012 Mac Mini won't Wake After Hours of Sleep (Hibernates/Powers Off)")
The sleepimage file still reappears even if never slept. Delete it (hibernate off, etc) - within minutes its back.
A note on that here - http://www.xlr8yourmac.com/feedback/Chameleon_SSD_Optimizer.html
About iMac sleep...
http://forums.macrumors.com/showthread.php?t=1529750
Try this: "sudo pmset autopoweroff 0" and "sudo pmset standby 0"
http://xlr8yourmac.com/archives/sep13/091313.html#10.8.5SleepEjectTip

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