For the past few weeks, my C-5 hub has stopped talking to Z-wave devices during the middle of the night. Once it stops, it does not resume communication. Rebooting the hub fixes the problem. The hub is running 188.8.131.52 and the device configuration hasn't changed in months. I have 30 Z-wave devices and 3 Zigbee devices. The Zigbee devices work fine, even when the Z-wave devices don't.
In general, the hub has been working well until this problem arose. Most of the time, Z-wave devices are very responsive.
I tried just setting up a nightly reboot, and that worked for several days, but then the problem started happening in the evening as well. I powered down the hub and removed power for 5 minutes. The hub still had the problem that night.
I am not aware of any ghost devices that are repeaters. (I do have a battery-powered siren that has been offline for a long time.)
In the past logs, I could see the point the hub stopped receiving messages from devices and there wasn't anything else that seemed like an error message.
When the hub isn't talking to Z-wave devices, I am still getting the web interface and the hub is writing its own messages to the logs (fetching weather info, SunCalc updates, etc.). But no in-bound or out-bound Z-Wave traffic. Actions from a Dashboard have no effect on the device.
Oddly, when I go to one of the physical switches (a GE/Jasco dimmer) and turn it on, I see that state change in the hub device. But then trying to turn the device off/on from the hub does not work.
I've watched the log during the day to see if there's anything weird happening, but I don't see anything unexpected.
I've looked through similar incidents, but those corrective actions don't seem to work for me.
I realize that the hub is a bit old... probably 3+ years. But it seems very strange that a reboot corrects the problem. Again, this hub has been pretty reliable up to now, and the device configuration has not changed.
Any ideas? Thanks in advance.