Internet settings will have an option for a network reset, which seems to work most of the time. My issue has always been the reverse; computers disappearing off the network after an update. Stupid thing is that the newly invisible computer can still see the rest of the network. At no time has any of them lost internet access. Just random machines disappearing. M$ also changes your sharing options too, so you've got to re-set them, not that it helps much.
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