Yosemite disconnects drive without properly ejecting when it goes to sleep

I recently purchased a Seagate 3TB USB 3 external hard drive. The drive is connected to a USB3 hub which is in turn connected to my mid 2014 rMBP. When I come back to the machine after it has gone to sleep (say, I come home from work and wake up the computer), there will be literally dozens of notifications waiting stating that the USB drive was not properly ejected before being disconnected.
I never receive this notice while I am actively using the computer and have had no other issues with the drive. I can't remember when this started happening. I do not recall experiencing this with another drive, but will hook up another external drive, let the machine sleep for a bit and then come back to see what happens.
Some other information:
- I have a sparse bundle disk image on the external drive. This disk image is used by Time Machine.
- The drive has been added to the privacy list in spotlight search's preferences
I believe there are others having this issue. Any fixes? Is apple aware of this issue?

This is probably due to the USB3 hub. try to use the drive for a "sleep" or 2 directly plugged in the Mac, and see if the problem indeed comes from the HUB not reacting properly to the Mac sleep.
The fact that the Time Machine is on this drive or that the drive has been added to the privacy list can't be what have caused it (but thanks for posting it, that does help us sometimes)

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I have a 2-month-old iMac, and have had a USB external SATA-enclosure 2.5" 500gb drive attached the whole time. About a week ago, it started randomly giving the "Drive not properly ejected" message and usually it remounts after a few seconds. Sometimes it doesn't and I have to unplug it and plug it back in.
I thought the drive was at fault, so I switched it with a similar drive that was connected to my AirPort Extreme base station. The problem stayed with the Mac. Also I imagined that (somehow) the iMac wasn't supplying enough power, so I bought a powered USB hub. The result is the same.
I don't understand how it can work for two months and then suddenly get this problem. The only change along the line is that about a week ago I did a software update ("About this Mac" says it is 10.6.7). The latest update DOES coincide with the appearance of this problem.
How do I resolve this?
(Notes: There at least one other thread here where people seem to think that this is a Time Machine problem. I think this is because many people connect large external drives for the purpose of backup. I upgraded to iMac from Mac Mini. I installed Snow Leopard right after I bought the iMac and then tried to restore from my Time Machine backup. Something went wrong, so I mirrored my Mac Mini drive onto a 500gb SATA 2.5", put it in a FireWire enclosure and boot from that. I use the iMac's internal 1T drive for Time Machine. That may sound like "lazy man solution", but it could have a great advantage someday where I could plug that FireWire drive into my Mac Mini and not have any downtime should iMac need to be repaired. The random disconnecting of the USB drive doesn't coincide with any Time Machine events. TM is working fine.)

Kappy,
Thank you for your help with this problem!
Your hypothesis for the drive/enclosure being a problem is good thinking, however:
-The problem never existed for the first two months I had the iMac.
-I can switch similar drives with iMac and AirPort Extreme, and the problem stays with the iMac.
-It has nothing to do with Time Machine as I am using a FireWire drive to boot, and the iMac internal 1TB for Time Machine.
-A friend suggested a cable problem, but I have tried many combinations and it wouldn't explain why suddenly after 2 months three sets of USB cables can fail at the same time (at least one, I used for 3 years with Mac Mini.)
I now have a 111gb drive connected to my AirPort Extreme and it has been copying files to my FireWire drive slowly but surely for two hours now. The same drive disconnected after 13 minutes on the iMac. All indications are pointing to OSX 10.6.7. The perfect test (for anyone with convenient resources) would be to install Snow Leopard from disc on a clean Mac and not upgrade it, plug in a USB drive and see if it can last a day or two. Then, upgrade to 10.6.7 and see what happens. I hope someone can try this.
(Is this a ploy to try to sell more FireWire equipment? I hope not.)

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Previous to Mavericks (10.9 - 10.9.1) I've had no issues with external firewire or thunderbolt connected drives to be put to sleep. However, since Mavericks all of my external drives are not put to sleep when my iMac, or Mac Pro go to sleep.
How can a company such as Apple, pushing people to have external devices like hard drives, is not on top of fixing this issue? Apple pushed for firewire and thunderbolt, thus All external drives I've owned are firewire. Because of speed. I bought thunderbolt adapters for firewire, and before Mavericks all worked great. Now that we have 10.9.1 update, this is still an issue!
I'm aware of the temporary solution of connecting the drive through USB to make it work, this is not a solution, but a hack.
Please let Apple know that this is a known issue, and there should be a fix for it. Everyone's data depends on it! Not only current external backups, but also external sensitive hard drives we rely on. Currently, the following makes are experiencing this issue: Lacie, OWC (Elite Pro), WD, Promise, Seagate, Toshiba, G-Drive.
Other Apple Support Communities related thread:
https://discussions.apple.com/thread/5486167?start=60&tstart=0
https://discussions.apple.com/message/23541363
External References:
http://blog.macsales.com/21004-upgrade-to-mavericks-drama-free-with-owc
http://forums.macrumors.com/showthread.php?t=1659332&page=3
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I have tested it at home wifi tonight. My phone and my wife's iphone (both iPhone 5 with iOS 6.0) do the same.
With cellular data on (aka airplane mode OFF) with WIFI ON
Wifi icon replaced by ATT's LTE icon once the phone was waken up from sleep mode; but within 2 secs, the wifi connection got reconnected again.
With cellular data OFF (aka airplane mode ON) with WIFI ON
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On a separate note, after i rebooted my phone, i can see it does "searching" the ATT's signal, then it shows "No Service", then next second, it shows ATT with full bars and LTE icon.
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Here is a document for Getting the Latest Firmware and Product Updates.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02979046&cc=us&dlc=en&lc=en&os=4063&product=507...
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http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03678348&tmp_task=solveCategory&cc=us&dlc=en&la...
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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
Gemini02
I work on behalf of HP

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I am employed by HP

Yosemite disconnects drive without properly ejecting when it goes to sleep

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