This could be a shot in the dark, but I ran into a similar problem where it looked like i had one drive dying at a time consistently. I replaced the drive and the error would switch to another drive in the array. It was driving me nuts.
Try rebooting the server and doing a memtest. I had a stick of ram go bad and it caused me to replace half of the components in my server before I discovered it.
UDMA CRC error count keeps rising, placed in error state (v6.6.2)
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This could be a shot in the dark, but I ran into a similar problem where it looked like i had one drive dying at a time consistently. I replaced the drive and the error would switch to another drive in the array. It was driving me nuts.
Try rebooting the server and doing a memtest. I had a stick of ram go bad and it caused me to replace half of the components in my server before I discovered it.