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It was probably the router since a reboot solved it. I have a very old router and if I want to maintain connections I have to assign static IP addresses or I am forced to reboot both the router and the device that can't connect to the router. I was having to reboot frequently so I went to static IPs and haven't had any major problems.
There is probably some table in the router that doesn't get updated and doesn't allow your dynamic IP address to work. It doesn't necessarily affect all dynamic IPs either. Consumer grade routers aren't very sophisticated machines.
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