A few of my coding-agent seats started reporting connection failed. Not all of them. Not all the time. Just enough to stall work for hours.
The bug was not in the agents, the model provider, or the gateway in front of them. It was the ISP router at home: a VNPT iGate GW040-NS that had started dropping most full-size packets.
This is Part 1: how I found it, what I measured, what I’m replacing it with, and the setup plan. Part 2 covers the real cutover once the hardware is on my desk.