I have had a Powerbox Pro running for several months using only OSPF for routing. Previous hop is a CCR2116, which is functioning properly, several other routers have adjacency to this one. Suddenly no routes on the powerbox pro. No config changes, no firmware changes (did upgrade to see if it would solve the issue, NO), have cleared OSPF config and set up again and still will not form an adjacency, stuck in Init state. Have static routes in place now but need OSPF working. Both routers are on Ros 7.21.3.
You could ramp up the logging for ospf to see what is happening.
Perhaps the mtu has changed??
/system logging
add topics=ospf