Yes, I should have thought of that. We had a power outage for several hours. When that happens, the router will reassign IPs which is exactly what happened.
I will try the static DHCP workaround… thank you for that suggestion!
BTW, this add-on helps me out a lot. I have nine logitech harmony hubs in my house that are integrated with smartthings. Three of those hubs have Yamaha receivers associated with them. For some reason, the IR Power on/off commands do not seem to be discreet for the Yamaha receivers. The only way I can get them to turn on/off properly and consistently is by using this device handler in conjunction with Harmony. I set the receivers in Harmony to have no power on/off commands then I use this DH to power them on/off instead.
I really appreciate the work you put into this. Thanks davidn!