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Spurious RAID controller failures. Is my controller bad or are my disks bad?

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http://serverfault.com – I have a Dell T7500 with a PERC H710P connected to 4 3T drives in a RAID5 array. Also connected to the controller are 2 256G SDD drives, not configured in an array. A Linux server is installed on one of the SDD drives, and the RAID5 is where all my user data are stored. The other day upon boot, the RAID BIOS reported errors Drives 01 and 03 missing Foreign config available I loaded the foreign config, and the drives reappeared. On the next boot, I got Drive 01 offline Thinking the drive was bad, I replaced it with a new drive and rebuilt drive 01. When I next booted, the system came (HowTos)