I had the same issue as you. Sometimes after losing the internet connection or power failure my Obi200 would not reconnect until I rebooted it. I fixed mine by assigning a static IP address to the Obi outside of the routers DHCP range. So if the router assigns IP addresses 192.168.1.1 to 192.168.1.100, assign an IP address greater than 100, e.g. 192.168.1.110. You can assign a static IP using Obi Expert on the portal or on the local webpage.