Updated to C8 to 2.3.5.121 yesterday and so far had four sensors (2 Iris v2 motion, and 2 Visonic MCT-340 contact) fall off.
I've reset/re-joined all four and will monitor. These devices have been on my mesh for many years and never had issues, very reliable. All have batteries that are >50%.
Found a couple more devices, two SmartThings buttons were also MIA/inoperable. Typically don't have any issues w/them.
Oops - one of the contact sensors and one of the motion sensors fell off again last night after I had reset/re-joined them.
Going to re-re-join them and monitor. These devices have always just worked in the past...
I’m not even going to tell you what I’ve been going through. These stupid Hue button controllers still won’t drop.
Don’t be mad. I couldn’t help myself.
You might want to include what model hub you did this on.
Oops! 
Fixed - C8.
The last few updates I've done on my new C8 hub (including one this morning to the latest update) have caused my 2 LUX KONOz Zigbee thermostats to drop. Never had an issue on my C5.
I posted a thread and support responded stating "we're working on it...".
Do you think that the issue is "differences between ZHA 1.2 and Zigbee 3"?
Couldn't tell you at this point. I'm not putting my C5 back, so I just have to wait for support to resolve the issue.
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Download the Hubitat app
