I have seen these errors before (Jiffies and buffer errors) are related to Network and are from Watchdog service. Its mean that NIC can't send data or receive and hangs up. Check the NIC's, cables and or switch - I had in past had a customer that changes out a NIC to test and found out that it was going bad, I admit it was weird but test this if you can.
Try to update to version 410 build 2584. Burn the ISO image onto a CD-ROM and update the NAS-R3 Enterprise. If this continues I want you to send logs to support@open-e.com so we can see what is going on.