Externals being ejected improperly

I have five external drives connected to my 27 inc 3.2 GHz i# iMac. When the computer goes to sleep, it frequently returns with the "This disk was not ejected properly" message and one of the drives is no longer mounted. Sometimes I can get it remounted using Disk Utility, sometimes I need to do a complete restart.
If this happens often enough to one of the drives, I have to run Disk Utilities "Repair disk several times to get the data back.
Is anyone else having this issue, and what can be done about this.
FYI - I never had this problem with my older 20 inch iMac with the same drives.

yes it shows up, but only the empty partition (drive) that still works, connected through thunderbolt, i haven't tried a different computer yet, i did however check the enclosure by switching the working drive with the non working drive and that still gets picked up and the important drive is still no where to be found, just seems so strange that we are here in this age and a simple unhooking of wiring can break something

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