Just kidding, there is no closure. I could not replicate this issue again after multiple reboots.
Linked original thread: https://lemmy.nz/post/1024414
Just wanted to say thanks to everyone for their suggestions, and easier to make a post here than reply to each single comment.
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Ask the network admin about arp tables and caches. If it’s your router then upgrade firmware (or change the OS on it).
If it happens again I’ll try that
