Samsung SmartThings Hub 2018 and 2015 model firmware version 0.30.5 will be released to customers starting today, Tuesday May 12th. This release is a hotfix for version 0.30.3 that includes fixes for control issues with certain devices.
Your Hub will briefly go offline as it reboots and applies the update; most users will experience less than one minute of downtime. Visit https://community.smartthings.com/t/hub-firmware-release-notes-0-30-5/193614
for more information. We will update the status page once the release has been completed.