Hyper-V connection sharing kills my host's connection

I'm using a setup where I have an ethernet connection on my host (Windows 8.1) set to share with a Hyper-V internal switch, then my VM (Windows Server 2008) connects to that. It works for a while (i.e. I can connect to the internet on my VM), but then not only does it stop working, it also kills my host's connection and I have to restart my machine. It doesn't leave any errors in either machine's event log when it happens.


And to clarify, when I say a while, it's not really any...

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