My external harddrive won't stay mounted in Lion

Hi gang!
I just upgraded my OS to Lion and I really like it for the most part. What I don't like is that for some reason my external HD keeps "unmounting" itself. I'm running 10.7.1 and my external drive is a WD 500GB drive using FAT32 formatting and connected via USB 3.0. The drive will mount for a short period of time, then the error screen pops up saying its been "improperly removed". Any suggestions would be awesome, I keep a lot of work files on my external drive.
Thanks!

My book world
Check here
http://wdc.custhelp.com/app/answers/detail/a_id/8422/p/247,264/c/0
I just solve the problem after 45 minutes with the lervel 3 WD support. You have to return to firmware 1.02.06 since the 1.02.10 version has a network card driver error and in some configurations (a lot more) the disk just stay connected for a couple of minutes. To do that you have to manually return to old firmware but WD do not has the file as public so you have to call them. One way to stay connected a bit more is making a permanent ping to the disk.

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The problem is that it won't mount after it has been unmounted. A friend of mine who's a Mac Repairman told me that it could be a number of things...
he told me to check if any smells were coming from the drive...
nope. check.
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Tell me if i'm off.
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My external harddrive won't stay mounted in Lion

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