I'm relatively new to using BIND and am having a bit of a problem. We are running a preconfigured BIND 8 on a Redhat box, we just used a webmin tool to add the domain and hosts we required. Everything seems to work fine, it resolves names normally etc, until sometimes it simply seems to stop (normally I find this out because my email client starts complaining that it can't find the domain). We have been solving it by rebooting the box, whereat it will run smoothly for another period of days before dying again.
Like I say I'm new to BIND so I'm not really sure what I'm lokoing for to debug this problem, any advice would be appreciated.