Named has been working fine for months on Fedora core 14 with updates current.

a few days ago it stopped working. I tried a service named restart and received the error message:

stopping named: umount: /var/named/chroot/var/named: device is busy

I tried using kill process, which did not work. However if I use kill 9 <named process>, followed by service named stop, I can then restart the service and it works for a number of hours (less than a day), then stops again and produces the error message above when I try to restart it.

I can get it working again using the procedure above, but only temporarily.

Anyone have any ideas what might fix this issue permanently?

Thanks
switcher