External drive corruption after 10.8.5 update

Hi,
After the upgrade to 10.8.5. my Mini server at home, which had been running for months on end without a hitch prior to that, started having big problems.
I have a late 2012 Mini, with a Sharkoon 5 disk cabinet hooked up through USB3.0. The cabinet is filled with (top to bottom) 2 * 1 TB drives, 1 * 300GBdrive and 2 * 2 TB drive.
A few days after the update to 10.8.5 disk started disconnecting. Or rather, they would report normal sats in 'df' but they wouldn't show any files, neither in Finder nor with 'ls'. Disks 1, 3 and 4 looked mounted (albeit empty), but 2 and 5 were not. I noticed very high (red LED) activity on disk 2, disk 2 showed up corrupt in DiskUtility, so I took that one out. Now the rest came back, but disk 5 was corrupted and unusable. I reformatted, put disk 2 back and reformatted, restored and on I went.
Couple of days later: same thing. When the corruption occurs, after some time all other disks, although still there, become unusable as well. In the end you cannot even login to the iMacs that are using this server for OpenDirectory etc. 
After the second time I suspected hardware failure on disk 2 and removed it from the cabinet. Formatted disk 5, restored, etc. But a few day later it happened all over again, this time with disk 5 seeming to be the culprit. I took that one out as well now, and I have to wait if the rest stays stable now.
In other words, it seems like the second of each set of identical disks is causing problems.
So my questions:
1) Has anyaone else seen anything similar?
2) Would changing out the disks, so that the identical sets are not adjacent, possibly fix this?
3) Would the latest fix release of 10.8.5 possibly fix this?
4) If all else fails, is there a way back to 10.8.4?
Any (other) ideas?
TIA,
Peter

Try running the combo update. It contains the latest update and will sometimes fix some other problems.
10.8.5 Combo Update

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