Diagnosing Sonoff Zigbee Contact Sensors Failures

[csteele]

Well that puts a big dent in my hypothesis, doesn't it?

Take a look at the route info and see if there are any repeaters the problem lights are associated with that could be your problem:

http://<yourHubIP>/hub/zigbee/getChildAndRouteInfo

Then see if this helps with interpreting it:

Zigbee issues

(TL;DR: Also note those neighbor table entries showing age:7 with outCost:0; that's an indication they aren't useful for routing to the mesh) The 'Neighbor Table Entry' section contains info from the most recent link status messages received from up to 16 routing nodes that the hub will consider using to transmit to your entire Zigbee mesh (as the 'first hop' of a single or multi-hop route). Even if you have more than 16 routing devices in your mesh, the hub can use only one of the 16 neigh…