I am using a Smarthings hub with Z-wave devices. Yesterday, I reset everything (removed, excluded and paired) and everything was working last night. This morning I saw that the hub was online but all the devices were “unavailable”. I started a Z-wave network repair about 3 hours ago and it is still ongoing.
There seems to be a general bug, which SmartThings have acknowledged, which relates to z-wave and zigbee devices which are battery powered. Some have reported that z-wave plus battery powered devices are not affected.