External Drives sometimes eject themselves

I've had an issue with some of my external hard drives where they will randomly eject themselves but then just as quickly remount itself. I thought perhaps it had something to do with the USB hub, but I've plugged it in directly to the computer and it will still randomly do this. I've noticed this with 3 or my 4 drives. It did this is 10.5 and still doing it in 10.6. Any other ideas?

I'm having this problem on a Mac Pro running 10.5.8.
Here's an excerpt of my syslog:
9/24/09 4:40:19 PM mds[35] (/Volumes/TOM'S DRIVE/.Spotlight-V100/Store-V1/Stores/55A8E770-6A1C-44DD-B127-95FB46EB6177)(Err or) IndexCI in indexCommitShadow:fturncate err: 22
9/24/09 4:40:19 PM mds[35] (/Volumes/TOM'S DRIVE/.Spotlight-V100/Store-V1/Stores/55A8E770-6A1C-44DD-B127-95FB46EB6177)(Err or) IndexCI in CIMetaInfoSync:sync err: 22
9/24/09 4:40:19 PM kernel jnl: disk5s1: writejournalheader: 0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [ErrType IO] [ErrNo 13] [IOType Read] [PBlkNum 9220920] [LBlkNum 89824] [FSLogMsgID 338152298] [FSLogMsgOrder First]
9/24/09 4:40:19 PM kernel error writing the journal header!
9/24/09 4:40:19 PM kernel disk5s1: media is not present.
9/24/09 4:40:20 PM kernel jnl: disk5s1: close: journal 0x8183c18, is invalid. aborting outstanding transactions
9/24/09 4:40:24 PM kernel USBF: 1084.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:40:24 PM kernel USBF: 1084.652 [0x7ff7100] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 2 of hub @ location: 0xfd000000)
9/24/09 4:40:24 PM kernel USBF: 1084.652 [0x7ff7100] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 2 of hub @ location: 0xfd000000)
9/24/09 4:40:24 PM kernel USBF: 1084.652 [0x7ff7100] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 2 of hub @ location: 0xfd000000)
9/24/09 4:40:30 PM kernel USBF: 1090.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:40:30 PM kernel USBF: 1090.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:40:36 PM kernel USBF: 1096.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:40:36 PM kernel USBF: 1096.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:40:42 PM kernel USBF: 1102.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:40:42 PM kernel USBF: 1102.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:40:48 PM kernel USBF: 1108.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:40:48 PM kernel USBF: 1108.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:40:54 PM kernel USBF: 1114.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:40:54 PM kernel USBF: 1114.621 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:41:00 PM kernel USBF: 1120.622 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:41:00 PM kernel USBF: 1120.622 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:41:05 PM kernel USBF: 1126.622 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:41:05 PM mDNSResponder[16] ERROR: mDNSPlatformWriteTCP - send Broken pipe
9/24/09 4:41:05 PM mDNSResponder[16] tcpConnectionCallback: error writing
9/24/09 4:41:05 PM mDNSResponder[16] tcpConnectionCallback: error writing
9/24/09 4:41:12 PM kernel USBF: 1132.622 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:41:12 PM kernel USBF: 1132.622 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:41:18 PM kernel USBF: 1138.622 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:41:18 PM kernel USBF: 1138.622 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:41:24 PM kernel USBF: 1144.622 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:41:24 PM kernel USBF: 1144.622 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
9/24/09 4:41:30 PM kernel USBF: 1150.622 AppleUSBEHCI[0x7dd2000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)
The USB device is a Cruiser Micro 16gb thumb drive.
Thanks for any help.

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