Interesting. Same here.
Last night it was about 10:55 PM central. I had to reboot again myself after to get all devices back online. It was a mess:
2017-09-06 10:56:20.593 PM CDT
18 hours ago HUB zwStatus ready Z-Wave is ready
2017-09-06 10:56:16.980 PM CDT
18 hours ago HUB hubStatus zw_radio_on
2017-09-06 10:56:16.974 PM CDT
18 hours ago HUB hubStatus zb_radio_on
2017-09-06 10:56:16.970 PM CDT
18 hours ago HUB hubInfo hardwareID:000D, version:13, ... hardwareID:000D, version:13, mac:xxxxxx, localip:xxxxx, localSrvPortTCP:39500, localSrvPortUDP:0, zigbeeFWMa...
2017-09-06 10:56:14.285 PM CDT
18 hours ago HUB hubStatus zw_radio_on
2017-09-06 10:56:14.278 PM CDT
18 hours ago HUB hubStatus zb_radio_on
2017-09-06 10:56:14.274 PM CDT
18 hours ago HUB hubInfo hardwareID:000D, version:13, ... hardwareID:000D, version:13, mac:xxxx, localip:xxxx, localSrvPortTCP:39500, localSrvPortUDP:0, zigbeeFWMa...
2017-09-06 10:56:12.850 PM CDT
18 hours ago HUB index:17, ip:7F000001, port:0BB8, requestId:2xxxxxx, headers:SFRUUC8xLj index:17, ip:7F000001, port:0... index:17, ip:7F000001, port:0BB8, requestId:xxxxxx, headers:SFRUUC8xLjEgMjAwIE9LDQpTZXJ2ZXI6IFZp...
2017-09-06 10:56:11.382 PM CDT
18 hours ago HUB ping ping ping
2017-09-06 10:56:11.324 PM CDT
18 hours ago HUB register register register
2017-09-06 10:56:11.310 PM CDT
18 hours ago HUB activity active Your SmartThings Hub at Home is now active.
2017-09-06 10:56:11.304 PM CDT
18 hours ago HUB hubStatus active Your SmartThings Hub at Home is now active.
2017-09-06 10:55:32.561 PM CDT
18 hours ago HUB hubStatus disconnected Your SmartThings Hub at Home is now disconnected. Please check your internet connection.
And I just looked in the logs again and see it happened at 4:07 PM central. This time it looks like everything recovered on it’s own.
2017-09-07 4:07:36.970 PM CDT
50 minutes ago HUB activity active Your SmartThings Hub at Home is now active.
2017-09-07 4:07:36.965 PM CDT
50 minutes ago HUB hubStatus active Your SmartThings Hub at Home is now active.
2017-09-07 4:07:20.153 PM CDT
50 minutes ago HUB hubStatus disconnected Your SmartThings Hub at Home is now disconnected. Please check your internet c