Hey, I’m experiencing the same… I went on vacation for a month, and for that reason I paused my internet subscription as I didn’t want to pay for wifi while I’m gone. When I got back yesterday I opened my subscription again, all devices started working immediately… except… smartthing hub. First I tried rebooting it, then rebooting my router, then removing my switch and connecting the hub directly to the router. No cigar. when it boots up it first lights red for a few seconds, then start blinking blue and quickly turn to solid blue.
I’m literally going to return it if there is no other way of getting it back online without losing all my configuration, that is just completely unacceptable.
Please ping me if anyone finds a solution to this.