dhcpd stops/hangs after between 45-60 minutes

[grantst@cooley]

I am having a problem with one of my remote site DNS/DHCP servers. The issue I am having is that as of last week DHCP stops working after 45-60 minutes most of the time. This server has been running for the last two months with no problems and the problems above just started last week. I do not see anything different in the dhcpd.log file or any errors there. When the service stops handing out leases/IPs I can sometimes do an rcdhcpd restart command and it will restart the service and I'll be up and running for another short time. Most of the time though the command will stop the service and then get hung in the starting service part. I've let it run afterhours to see if it would get past there hang up but as of yet the only way around the issue is to reboot the whole server. Has anyone run into this problem?