Well, I did have some discussion on the slack channel on the same matter. Long story short is that most routers that I did have suck (Tradfri of IKEA), so I ordered a few Innr Z3 GU10 spots, which apparently are way better as Zigbee (3.0) routers. Since I have them in the network, it is much more stable and I’m not losing devices. However I’m still cautious for adding more new devices.
And I have quite a lot more Tradfri GU10 spots connected via the Tradfri gateway/hub and the related app and notice that they work much more stable in that setup. So until the Zigbee rewrite I will keep them separated for sure. Maybe by then I’ll give it a try to include them in the same Zigbee network, for a better mesh.
And now it still is a long story 
But my advise to you is get a few good Zigbee routers.
Cheers,
JW
