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For last couple weeks I have the same problem, once a week, usually on Sundays
Obihai support is useless.
What I found:
I assigned static IP address for my Obi100 in router. Then I got flashing red/green and Obi got "locked" to assigned IP address. I removed static IP address from table in router - the same thing...
So. Last weekend I managed to ressurect Obi. I flashed firmware couple times. Then I managed to get in into original status. And found out, that default value for IP address in Obi is not DHCP but Static!!! So I had to use voice system (IVR?) to set new IP and subnet that matches my router. From there I changed settings in Obi to DHCP.
But today it's locked again... So I'm fighting
One more thing: I noticed (may be it's coincidence) that by unplugging power ADAPTER from receptacle to cycle power I get better chances to resurrect Obi then by unplugging cord from Obi itself. May be some diode gets stuck in power supply...
Anyway. It's not nice business model to make product that lasts only 2 years to force customers to buy new version...
PS. My next VoIP adapter will not be from Obihai