[ubuntu] Ubuntu 12.04: System freeze; mdadm issue?

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http://ubuntuforums.org – So I've been having this wonky issue lately; it seems that my new Ubuntu 12.04 install freezes and it may be mdadm related. My install is as follows: 4x750 GB drives, each partitioned the same: ext2 partition, swap partition, ext4 partition; the ext2 and ext4 are then RAID5'd together to have a single ext2 and ext4 partition, mounted on /boot and / respectively. This usually works fine and dandy, but randomly freezes the entire system. I then reboot to usually find 2 drives randomly out of the array and have to force them back in and let it resync which is a huge pain. I've looked around fo (Hardware)