LOTL

I have been having a lot of trouble writing to my 256MB Lexar SD card.
Im getting the following error when i try to write and or delete files or folders from it, also when i try to create folders on it.

"Cannot delete or create file or folder: access denied"
"Make sure your mobile device has sufficient memory, that the file is not set as read-only, and that you have permission to copy this file type."

I'll get this error at certain times and then i try again and im able to copy the files i want. Some times it appears that its transferring the files and that it seems to complete the transfer, but nothing is showing on the SD card.
This is on an X5 with WM2003, and i have had this in use for about 9 months. Storing mainly maps for my GPS on the SD card.
But now using it for storage of MP3 internet radio broadcasts as well. Plenty of space left on the card so that is not the issue.
ActiveSync version 3.71 build 3244

Thanks