USB drives keep unmounting by themselves

This keeps happening over and over...
my USB drives are unmounting by themselves.
with no prompt or eject.
I've tried to re-set the PRAM. with no luck.
is this a on-going problem?
what can I do?

There are several reasons this might be happening so you'll need to provide us with more information.
1) are the drives connected directly to the computer or to a hub? If to a hub, try removing the hub and see if a drive or two connected directly to the computer will stay mounted.
2) who is the manufacturer of the drive(s)?
3) has this been an ongoing problem from day one or did it just recently start after a long period of stability? If the latter, did you make any changes about the same time the trouble began?

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