If your going to stay on DSSV5, you should be running the latest build: 4562
The original post has a degraded RAID, and while its rebuilding, this can affect many things. A light load on the system is preferred during this period.
Due to various firmware changes on the RAID, and drivers in DSSV5, you may have reached an incompatible point here.
Can you try the booting the trial version of DSSV6, to see if your problems are resolved?
Tuning is important as well as the bond type being used. V6 can allow a wider range of tweaks in this regard.
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