FCP7 - media is becomes disconnected on Xsan unprovoked by user

Hi folks,
I ran across this issue a month or two ago with one of my student workers. We were able to fix the problem on the fly and I just assumed it was user error that caused his files to go wonky, but now I can't see that as the answer. I don't really know how to describe the problem without just saying what exactly happened:
I exported a video yesterday morning. The sequence was perfectly intact and there was no missing media anywhere in the project (which isn't big, 1 sequence, and only about 15 gb of ProRess422 movies in 18 clips). After exporting I closed the project; throughout the rest of the day yesterday I worked on other projects, but never that project.
Today, I opened the project and 6 of the 18 clips show up as offline. When I click reconnect, FCP tells me it's looking in the root directory of the Xsan for the clips, where they have never been located. I did a Log and Transfer from a Canon Vixia first thing when I started the project so the .mov's went straight to the Capture Scratch (which has never moved).
When I go to "Locate" the files, the clips in the Capture Scratch that I should be able to reconnect with are grayed out. If I deselect "Matched Name and Reel Only" then I can select the file I want, but when I do I get the message: "File Attribute Mismatch - some attributes do not match the original, etc.." If I say "Continue" then it reconnects and ends up being the wrong file (that threw me for a loop).
So after this happened I went into my Finder into the Capture Scratch and went through the 18 clips. It looks like what happened is some files were deleted, and then replaced with the same name but with a different file. Specifically: I have clips 138-155. Clip 146 is now the exact same as Clip 153, whereas yesterday morning they were completely different.
Has this happened to anyone else? It could very well be an issue with our Xsan too, but thought I'd ask around here since I've only noticed the problem in FCP.
Running FCP 7.0.3, and OSX 10.6.8 on MacPro and Xsan. Xsan is hooked up via fiber.

We are having the exact same problem, but it's much more widespread. For the record we are using the following:
Mac OS X 10.6.8
Xsan 2
Final Cut Pro 7.0.3
Sony NX5U AVCHD media logged and transferred to ProRes 422 (proxy)
Sometimes our students can reconnect without issues, but often it's next to impossible to reconnect, so they have to batch capture their footage from their archived media. For one or two clips, this isn't too bad, but sometimes it's almost an entire project. I can confirm that this is the same issue because the clip paths in FCP now just list "Xsan:" (our Xsan volume name) or "Xsan:Clip ####.mov" (where there should be many other folders). Permissions aren't an issue, because all the files show up in Finder and can play back in QT without issue.
One thought I've had is about how FCP auto-names the ProRes clips as they are ingested from . All the clips are sequentially numbered as Clip #1, Clip #2, etc.. If a student ingests from more than one media archive (or SDHC card), they will have multiple Clip #1s, Clip #2s, etc.. In Capture Scratch, FCP will automatically increment the clip name until it finds the next available name. Example:
Card A
Clip #1
Clip #2
Clip #3
Card B
Clip #1
Clip #2
If I ingest the following from Card A:
Clip #1
Clip #3
And then try to ingest files from Card B, this is what I get:
Clip #1 becomes Clip #2 (the next available name)
Clip #2 becomes Clip #4
You can see what a mess this can become. The issue is further compounded when our students fail to uniquely name their archived cards. In the logging information, all the reels are listed as "NO NAME", so it's impossible to figure out whether a clip is from one card or another.
Most recently, I've noticed the following behavior: students reported that some clips suddenly started "flashing colors" and playing rapid random frames. When restarting FCP, the clips in question (and several others) were offline. This seems to be the first effect of this problem, but I can't trace it back to a specific cause.
Lastly, today, I discovered issues with students clips that had been recaptured after going offline. I saved the project with a new name in an attempt to distinguish the newly captured files from the old ones. One would expect a new project folder within Capture Scratch, but instead, I got several new clips right in the main Capture Scratch folder, all named "[new project name] #".
I'm thoroughly frustrated with all this, as are our students. I think some of this just boils down to maintaining a very rigid ingest workflow, but the offline clips is very troubling. Any other suggestions or similar experiences would be greatly appreciated!
Pete

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FCP7 - media is becomes disconnected on Xsan unprovoked by user

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