btw, they are the fastest sensors to connect I have at home and yes , they are rock solid.
I think it is a byproduct of the Zigbee 3.0 compliancy: when they fall back they are HA 1.2 certified (the previous generation is not) .
p.s. it is the only xiaomi device not using Markus's drivers (it uses my driver for sentimental reasons 
)
