Uuid of drive changing after sleep in Lion

I have an external drive where I keep my mail. Under SL this worked fine. However now under Lion every few times my Mac wakes from sleep mail crashes saying it can't find mail folders. Then I noticed that time machine is doing full backups of the drive when this happens, wiping out older backups of course. When I look in the TM logs is says:
Event store UUIDs don't match for volume: 3TB Backup
Deep event scan at path:/Volumes/Mail 1 reason:contains changes|must scan subdirs|new event db|
Notice the 1 after Mail. That isn't in the name of the drive. Again, never had this problem under SL.
The drive is a 3TB WD MyBook.

Thanks for the tip - though, in this case, it is a Mac Pro not a Macbook.
Apple had me move one of the drives to a thunderbolt port in the other "column" (there are 6 ports in to columns) and this seems to have resolved the problem, though I will change the ports back to how they were and see whether the problem resurfaces.
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