My Zigbee network used to have a dead zone at the far end of the house, a couple of sensors would drop out constantly, and the garage door sensor was basically useless. After a few weekends of tinkering, I finally got full, reliable coverage everywhere. Here's what actually made the difference, combining a few different fixes rather than one silver bullet.

1. Added more mains-powered routers
   Zigbee is a mesh network, and battery devices (like most sensors) don't repeat signal, only mains-powered ones do. I added a couple of cheap plug-in smart outlets in the hallway and garage specifically to act as routers. That alone filled in a lot of the gaps.
2. Repositioned the coordinator
   My hub was originally tucked inside a media cabinet next to the router and a bunch of other electronics. Moving it out into the open, up on a shelf and away from Wi-Fi gear, made a noticeable difference. Zigbee and Wi-Fi both use the 2.4GHz band, so proximity to your router can cause real interference.
3. Picked a clean Zigbee channel
   I checked which Wi-Fi channels my router was using and picked a Zigbee channel (in the Zigbee 2.4GHz range) that overlapped as little as possible. Less contention means fewer dropped packets.
4. Let the mesh rebuild
   After making these changes, I gave the network a day or two to let devices re-route through the new mesh paths rather than force-repairing everything at once. Route optimization isn't instant.
   The combination of these fixes took my Zigbee network from "flaky at the edges" to rock solid, including the garage sensor that used to fail constantly. If you're dealing with a dead zone, I'd start with router placement (#1) since it usually gives the biggest bang for the buck.

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