Installed a couple of Sonoff TRV zigbee devices a few months ago in an otherwise all-z-wave system and recently being encountering communications failures. Driver courtesy of @kkossev
I did suspect perhaps my C7 hub (with latest FW) might be located in a such a way that RF is not reaching the devices so have moved around a bit to see if it makes any difference, which it hasnt.
Investigating further today, communication is failing (in both directions) more regularly and the solution i found to re-establish comms is to power-off the device (remove batteries) for a few seconds then power back on, Communication is then restored.
Weird that the same thing has been happening on my two identical zigbee devices occuring around a similar time.
thanks for the info-
my zigbee channel appears to be set the same as yours channel 20 (default ?)
upon a scan i see only one item appearing on channel 25
should i see my own system plus all zigbee devices or just the hub in the table and what might be this "unidentified" item i see on channel 25