There are a few of us out here that are experiencing inexplicable ZB device drops on the C8 -- AFAIK thus far, there's no silver bullet with IDing certain problem-child devices, config, etc -- it's simply a case of "this was all fine on C7/5/4, but same setup is now all shaky & droppy on C8".
In my case, it's a couple of Third Reality blinds and one of 2 of my Yale zigbee lock modules that are the most habitual drop-off offenders. Oddly enough, the Yale module that drops is arguably the best positioned zigbee device in my whole setup, so I know this isn't a mesh/placement issue. Plus, this very same Zigbee setup was running totally smooth on my C7.
Those of us affected are hoping additional firmware changes will eventually improve things, but in my experience, attempting to chase improvements in the meantime is just a waste of time -- any improvement ends up being temporary, and you're soon back at square one again.
