File corruption on SDCard when multiple files are being written from WinCE 6.0R3

We currently have file corruption problems which we have been able to reproduce on our system which uses WinCE 6.0R3. We have an SDCard in our system which is mounted as the root FS. When multiple files are being written to the file system we occasionally
see file corruption with data destined from one file, ending up in another file, or in another location in the same file. We have already written test SW that we have been able to use to reproduce the problem, and have worked with the SDCard vendor to
check that the memory controller on the card is not the source of the problems.
We know that the data we send to WriteFile() is correct, and that the data which eventually gets sent through the SDCard driver to the SD card is already corrupted.
We believe that the problem is somewhere in the microsoft private sources between the high level filesystem API calls and the low level device calls that get the data onto the HW.
We have confirmed that the cards that get corrupted are all good and this is not a case ofpoor quality flash memory in the cards. The same cards that fail under WinCE 6.0R3 never fail under the same types of testing on Windows, Mac OX, or linux. We
can hammer the cards with single files writes over and over, but as soon as multiple threads are writing multiple files it is only a matter of time before a corruption occurs.
One of the big problems is that we are using the sqlcompact DB for storing some data and this DB uses a cache which get's flushed on it's own schedule. Often the DB gets corrupted because other files are being written when the DB decides to flush.
So we can reproduce the error (with enough time), and we know that data into the windows CE stack of code is good, but it comes out to the SDcard driver corrupted. We have tried to minimize writes to the file system, but so far we have not found a
way to make sure only one file can be written at once. Is there a setting or an API call that we can make to force the OS into only allowing one file write at a time, or a way of seeing how the multiple files are managed in the private sources?
Thanks
Peter

All QFE's have been applied we are building the image so we have some control.
I have build an image which used the debug DLL's of the FATFS and I have enabled all of the DebugZones. The problem is still happening. From the timings in the debug logs and the timestamps in the data which corrupts the test file I have been able
to see that the file is corrupted AFTER the write is complete. Or at least that's how it seems.
We finished writing the file and closed the handle. Then more data is written to other files. When we get around to verifying the file it now contains data from the files that were subsequently written.
What I think I need to do is figure out in detail how the two files were "laid down" onto the SDCard. If the system used the same cluster to write the 2 files then that would explain the issue.

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