On Thursday May 26, between 10:00 am CDT and 1:00 pm CDT, we will automatically update your SmartThings Hub to the latest firmware (version 000.014.00040). The update is expected to take less than 10 minutes, during which time your SmartThings Hub will temporarily go offline and events scheduled for this time will not process.
The firmware update includes a fix for a some users whose SmartThings Hubs periodically went offline as well as improvements to the identification of secure Z-Wave devices.
I hope this corrects the problems I have been having that require a reboot of the hub.