I wasn't able to determine the root cause of events/0 hanging up, but I did research wanpipe issues on PRI cards and performance loss. I believe i resolved the performance issue by adding the following parameters to /etc/grub.conf: "apic=on" & "acpi=off" and installing/starting the IRQ Balance addon. The IRQ Balance addon appears to have increased buffered and cached disk reads on /dev/sda by 3-4 times. Thanks guys,
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