What exact model and firmware level are your WD 2TB drives?
There have been a number of people that have had problems with WD 2TB having various timeout issues with several different Raid controllers.
Most have been cured with Bios updates to the Raid controllers but some have needed to update the firmware on the HD's themselves others have had to force the drives to Sata 150 mode to solve the issue.
I have had problems on occasion with the Areca BIOS locking up on Boot. If you are not booting from drives attached to the Areca you can disable the Areca BIOS.
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