When a full software download didn’t make a difference, I think now only Athom maybe can fix it. Please report to https://homey.app/support
One thing left you can try, is resetting Homey zigbee. But I think the chance of fixing it is low.
Be aware, a zigbee reset causes ALL of your zigbee devices being removed from Homey, and they have to be paired like new devices afterwards.
This will also break the flows involved.
But, there’s a very neat script which can repair these flows:
https://community.homey.app/t/how-to-pro-cloud-tool-to-fix-advanced-flows-after-removing-and-re-adding-devices/65018
.
Imho your problem is very much also the weakness choices made with your setup, by creating a single point of failure, and,
having way too much trust in computing devices and wireless radio protocols.
Homey (and probably many other domotica controllers) are in no way 24/7/365 devices to build on.
F.i. I can toss Homey out the door right now, the only thing what happens is my devices aren’t controlled by a machine anylonger.
I can still control any device manually.
It saved my ass a few times already 
