My OBi100/110's usually don't startup reliably if they are rebooted without the router being fully operational. My OBi's typically need rebooted again, either programmatically or by cycling the power, once the router becomes fully operational.
That's interesting, because I never experienced that problem with obi100 in spite of turning of the power 6days a week.
The big question here is : If this is not a bug but something we have to live with how do you handle power interruptions in situations where you have to keep ( one ) Obi in a remote location ? Installing an expensive power back up for the gateway and Obi ? They use together like 70 watts.