Raid drive periodically "missing"

I have an xserv 2.8 quad xeon with an internal raid (3 drives, RAID 5). Drive in bay 3 periodically showed up as missing and the raid set was degraded. I marked it as a spare and the raid set rebuilt. This happened several times so I replaced the drive with a new identical drive. Now it the same thing is happening again.
So my assumptions for possible causes are:
1. Raid card has failed (unlikely?)
2. The new drive in the same bay has failed (unlikely?)
It takes almost 3 days to rebuild the raid array so it is very time consuming to troubleshoot. What steps can I take to determine the actual cause of the failure and fix it permanently?
Thanks,
Eric

I'm having the exact same problem, or at least really similar.
I thought I'd configure everything as RAID-0, all brand new drives. Those shouldn't crash very fast.
Big mistake of course... But the weird thing is, in the RAID_Utility it says all the drives are "green" smart: checked and status: good. But it removed one of the disks from my raid. Is there any way I can "plug" that drive back into my raid set? Because the drive is ok, but it's just de-coupled from the set....
ty!

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Write to one port broken VI error list.JPG ‏47 KB
Readfrom one line broken VI error list.JPG ‏46 KB
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