How can a partition fail in a RAID 0 [closed]

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http://serverfault.com – I have three drives (sda, sdb and sdc) which are partitioned into two partitions each set to "raid linux autodetect". The first partition is used for a RAID 0, the second partition for a RAID 1 on LVM. For some reason sdc1 drops out of the RAID 0 and can only be re-added after a reboot. sdc2 stays in its RAID 1 though. While this happens, I can read sdc with fdisk, but LVM tools fail to start all together and report IO errors. I also get messages in the kernel log about communication errors. How can only a partition fail and drop out of a RAID? (HowTos)