Devices showing up as "This device is unavailable at the moment"

[johnahesch (John)]

Did your hub receive an update recently? Are you on 18.18 or 18.20 or 18.21?

Since you are using mostly Samsung devices this is probably not your issue but worth checking.

Hub Firmware Release Notes - 18.18

Starting on Wednesday, July 19th, we are going to begin rolling out Hub firmware version 18.18. Note that this is a rolling release, and you will be informed of your particular update time slot via email. Downtime for most Hubs will be less than 1 minute. This update will provide the following improvements: Faster boot times and local automations Increased reliability and performance for Zigbee devices Fix for problem with some Schlage Z-Wave locks not reporting lock status Firmware updates for SmartThings sensors and outlets, Sengled Classic bulbs, Iris sensors and the Halo smoke alarm EDIT 7-Aug-2017: There are multiple release versions as we work out issues affecting certain user’s setups. Here’s a round-up of versions to hopefully help ease some confusion: 18.21: Production user…