Device reported as having left the Zigbee network but is still working

Questions & Help
21

I have 10 smoke detectors, 2 heat sensors and 2 HAN all from Frient
Of these,
5 smoke detectors
1 heat sensor
1 HAN
have left the network.

I’ve for a time not been thinking the same, that this is a Frient issue, not a Homey issue.

I contacted Frient support, but they just refered to other post where people experience problems. Didn’t even seem to flirt with the idea that it might be Frient thats the problem.