Afternoon,
I have about 30 devices set up, and I have a device or two every week that just become unavailable(dead) and when I ping them using the menu under settings in the specific device page, they generally come back to life, and stay, but sometimes it only lasts for a day or two. My kitchen recessed lights have never really had an issue, but lately they become unavailable. Then last night randomly three devices in the same room were unavailable. Sometimes I’ll walk in the bathroom and hit the button on my sonoff panel, worked great for 6 months, but I’m pretty sure it’s the light switch not responding. My dimmers are all GE/enbrighten. Using a zwave dongle on a intel nuc running HA.