@davemark This actually looks like a bug in windows. Anything that causes the OS to fail is a bug. OK, so the TV is creating fake UUIDs each time it does a DHCP request. I don't know why HiSense does it, but it is about the only way to obtain privacy addresses and avoid DHCP tracking, so there are legit usages. Someone did not foresee the scenario and used an O(N) or maybe O(N^2) algorithm to maintain device lists, thus the stall. That's a bug.
Corrected 4/21: UPNP requests, not DHCP