Multiple DP2K Crash

Started having this with 3.1.8 and now it is also occurring with 3.1.9. I have a Hog 3, 3 DP2K, and an iPC connected to a network using a Netgear unmanaged 24 port switch. Served by an external DHCP server. Lately whenever I am accessing the rig using the iPC I get a complete restart on all the DP's. This will happen usually when I am in the programmer, but will sometimes occur when running cues. This did not happen before, and I am wondering if anyone else has had this problem. Also, any ideas on how to correct. I need to be on the network, as I will change ports and access another rig sometimes.
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