There is no obvious point of misconfiguration for this, it is usually it is tied into a complex interaction with (potentially many of) your other routers.
We would need more details to speak to this effectively, the below would just be a start.
How much time until you see the failure?
Is that time always the same?
If not what is the variation?
How and from where did you determine that they stop advertising?
Can you log into the switch during this failure, be it through HTTP, HTTPS, SSH, Telnet, or RS232?
What does the switch show as it's routing information during failure and when not failed?
Hardware version?
Firmware version?
Config File?
Topology?
Given the amount of information that would need to be gathered before we can speak effectively to your issue it would probably be best to gather this information then call BCS Support at 1 877 345 6555.