Firewire drives disconnect on their own

I've tried setting up two different Firewire 800 drives (1 Maxtor MyBook Pro II and two LaCie d2 Quadras). With both the drives aren't recognized right away. I have to reset the bus on the computer first.
Once each was recognized, they would disconnect at from what I can tell are random times, throwing up warnings that disks weren't disconnected properly and that data may have been lost. This happens with minutes of initially connecting to the disk. The disk will reconnect automatically a few minutes later, only to disconnect again in a few minutes.
Both the computer and the LaCie drives have up-to-date firmware. I returned the Maxtor because I thought it was faulty.
Help. Thanks, Bob

I undid the RAID and things were stable for a few weeks. Then, when I tried to set the screen saver to display pictures from one of my Firewire 800 drives (I have 2, daisy chained), the disconnecting / reconnecting started again.
Would appreciate any insights.
Here's an excerpt from the system log showing disconnect, reconnect, disconnect:
Mar 24 15:43:52 Den-2 diskarbitrationd[129]: disk1s3 hfs C07AA0A7-4921-3F2A-88A8-B66209AFC193 LaCie 2 /Volumes/LaCie 2
Mar 24 15:43:52 Den-2 diskarbitrationd[129]: disk2s3 hfs D4A97DE3-FC86-3ACF-8DFD-598F6BF768F7 LaCie 1 /Volumes/LaCie 1
Mar 24 15:43:52 Den-2 diskarbitrationd[129]: disk3s10 hfs 5F49C5CD-6583-37B1-9ED7-88FBD858F39A Den350A /Volumes/Den350A
Mar 24 15:43:52 Den-2 diskarbitrationd[129]: disk3s12 hfs 2CA43427-673F-38F8-9AC6-7E07B32875D6 Den350B /Volumes/Den350B
Mar 24 15:43:56 Den-2 /System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport: Could not find "2WIRE262" on any channel (directed scan)
Mar 24 15:43:56 Den-2 /System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport: Could not find "2WIRE262" on channel(s) 6
Mar 24 15:44:07 Den-2 /System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport: Could not find "Apple Network 6d0de5" on any channel (directed scan)
Mar 24 15:44:07 Den-2 /System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport: Could not find "Apple Network 6d0de5" on channel(s) 1
Mar 24 16:01:13 Den-2 kernel[0]: SetCryptoKey R: len 32, idx 2
Mar 24 16:06:07 Den-2 kernel[0]: disk2s3: I/O error.
Mar 24 16:06:07 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:06:07 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:06:07 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:06:07 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:06:07 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:06:07 Den-2 kernel[0]: jnl: dojnlio: strategy err 0x6
Mar 24 16:06:07 Den-2 kernel[0]: jnl: end_transaction: only wrote 0 of 32768 bytes to the journal!
Mar 24 16:06:07 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:06:07 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:06:07 Den-2 kernel[0]: disk1s3: media is not present.
Mar 24 16:06:07 Den-2 kernel[0]: jnl: dojnlio: strategy err 0x6
Mar 24 16:06:07 Den-2 kernel[0]: jnl: end_transaction: only wrote 0 of 16896 bytes to the journal!
Mar 24 16:06:07 Den-2 kernel[0]: jnl: close: journal 0x4a89d7c, is invalid. aborting outstanding transactions
Mar 24 16:06:07 Den-2 kernel[0]: jnl: close: journal 0x4a89c98, is invalid. aborting outstanding transactions
Mar 24 16:08:10 Den-2 kernel[0]: commaxtorIOPowSec00 overriding init
Mar 24 16:08:10 Den-2 kernel[0]: commaxtorIOPowSec00 overriding init
Mar 24 16:08:10 Den-2 kernel[0]: jnl: replay_journal: from: 30642176 to: 30975488 (joffset 0xe90000)
Mar 24 16:08:10 Den-2 kernel[0]: jnl: replay_journal: from: 5925888 to: 6184960 (joffset 0xe90000)
Mar 24 16:08:10 Den-2 diskarbitrationd[129]: disk1s3 hfs C07AA0A7-4921-3F2A-88A8-B66209AFC193 LaCie 2 /Volumes/LaCie 2
Mar 24 16:08:11 Den-2 diskarbitrationd[129]: disk2s3 hfs D4A97DE3-FC86-3ACF-8DFD-598F6BF768F7 LaCie 1 /Volumes/LaCie 1
Mar 24 16:17:19 Den-2 kernel[0]: disk1s3: media is not present.
Mar 24 16:17:19 Den-2 kernel[0]: disk1s3: media is not present.
Mar 24 16:17:19 Den-2 kernel[0]: jnl: dojnlio: strategy err 0x6
Mar 24 16:17:19 Den-2 kernel[0]: jnl: end_transaction: only wrote 0 of 24576 bytes to the journal!
Mar 24 16:17:19 Den-2 kernel[0]: disk1s3: media is not present.
Mar 24 16:17:19 Den-2 kernel[0]: disk1s3: media is not present.
Mar 24 16:17:19 Den-2 kernel[0]: disk1s3: media is not present.
Mar 24 16:17:19 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:17:19 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:17:19 Den-2 kernel[0]: jnl: dojnlio: strategy err 0x6
Mar 24 16:17:19 Den-2 kernel[0]: jnl: end_transaction: only wrote 0 of 24576 bytes to the journal!
Mar 24 16:17:19 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:17:19 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:17:19 Den-2 kernel[0]: jnl: close: journal 0x4a89c98, is invalid. aborting outstanding transactions
Mar 24 16:17:19 Den-2 kernel[0]: jnl: close: journal 0x4a89d7c, is invalid. aborting outstanding transactions
Mar 24 16:27:59 Den-2 kernel[0]: commaxtorIOPowSec00 overriding init
Mar 24 16:27:59 Den-2 kernel[0]: commaxtorIOPowSec00 overriding init
Mar 24 16:28:00 Den-2 kernel[0]: jnl: replay_journal: from: 30975488 to: 31000576 (joffset 0xe90000)
Mar 24 16:28:00 Den-2 diskarbitrationd[129]: disk1s3 hfs C07AA0A7-4921-3F2A-88A8-B66209AFC193 LaCie 2 /Volumes/LaCie 2
Mar 24 16:28:00 Den-2 kernel[0]: jnl: replay_journal: from: 6184960 to: 6285312 (joffset 0xe90000)
Mar 24 16:28:00 Den-2 diskarbitrationd[129]: disk2s3 hfs D4A97DE3-FC86-3ACF-8DFD-598F6BF768F7 LaCie 1 /Volumes/LaCie 1
Mar 24 16:32:06 Den-2 kernel[0]: disk1s3: media is not present.
Mar 24 16:32:06 Den-2 kernel[0]: disk1s3: media is not present.
Mar 24 16:32:06 Den-2 kernel[0]: jnl: dojnlio: strategy err 0x6
Mar 24 16:32:06 Den-2 kernel[0]: jnl: end_transaction: only wrote 0 of 24576 bytes to the journal!
Mar 24 16:32:06 Den-2 kernel[0]: disk1s3: media is not present.
Mar 24 16:32:06 Den-2 kernel[0]: disk1s3: media is not present.
Mar 24 16:32:06 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:32:06 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:32:06 Den-2 kernel[0]: jnl: dojnlio: strategy err 0x6
Mar 24 16:32:06 Den-2 kernel[0]: jnl: end_transaction: only wrote 0 of 24576 bytes to the journal!
Mar 24 16:32:06 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:32:06 Den-2 kernel[0]: disk2s3: media is not present.
Mar 24 16:32:06 Den-2 kernel[0]: jnl: close: journal 0x4a89d7c, is invalid. aborting outstanding transactions
Mar 24 16:32:06 Den-2 kernel[0]: jnl: close: journal 0x4a89c98, is invalid. aborting outstanding transactions

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3. Start up in safe mode and test, preferably without launching any third-party applications. If you don't have the problem in safe mode, but it comes back when you restart as usual, stop here and post your results. Do the same if you can't start in safe mode. If there was no difference in safe mode, go on to the next step.
4. Reset the System Management Controller.
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