At the end of March, I had this problem, which I posted on a HA Facebook group:
As of about 5pm yesterday, all my Zigbee devices started showing as unavailable.
They connect through a Sonoff Zigbee bridge that is flashed with Tasmota ZHA ZBBridge.
I can access the Sonoff over the wifi, so it’s running, but none of my motion, door or other sensors seem to be connecting to it.
Since then, it has happened multiple times, but always seems to be triggered by me updating HA to the latest build.
It happened yet again yesterday, and I had to get all my devices one by one and put them right next to the coordinator to pair again. I couldn’t do this with the door sensor, so I had to unplug the Sonoff to move it closer, but it did seem that all was well. All my motion sensors were triggering on movement, and the door sensor worked.
Now this evening, they are ALL showing as offline again. Reboots do not work, I will have go round and pair them all again. 
Someone suggested the Sonoff has problems, but it does allow me to run it in the house where most of my Zigbee devices are. I run HA on a Pi in my garden office, so if I put a USB Zigbee stick in there, I might not get the devices connecting anyway.
So, I’m looking for thoughts/ideas/suggestions. Would it be a bug in the ZHA integration perhaps? Hardware issue with the Sonoff? Or maybe the stuff I flashed on there with Tasmota is out of date ?
I’ve seen posts on here from years ago with the same problem but none seem to relate directly to mine - pretty sure it’s not wifi interference as they were all working perfectly for 6 months.
All help appreciated - I am pulling out what little hair I have left
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