Just a shot in the dark but my (4) DM-MD8X8 units and a DM-MD16X16 unit all stopped working until I replaced the installed Ethernet card with the upgraded CPU3 card. No problems after that. Prior to that, the units would continuously go offline and could not exist on our LAN. The 16X16 was upgraded and now works perfectly. The 8X8 units were taken off the public LAN and only exist on a local network within the cabinets. I have not had any issues with them since getting them off the network.

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-David