Windows DNS Servers records become stale and get deleted

To prevent manually added DNS names assign to static IP hosts from being deleted (automatic scavenging) use the following guidelines:
Best practice is usually to leave the no-refresh and refresh intervals to 7 days each. 1 day will result in to much scavenging activity and records may be deleted before they are refreshed. Do your servers have static ip addresses, they should not be configured by DHCP. Servers configured with static ip addresses will refresh their dns records often enough (every 24 hours i believe) to negate the possibility of being scavenged assuming the scavenging period is set appropriately, i.e. not less than the DHCP lease time. This is so that machines with dynamic addresses are not at risk of having their record deleted from DNS.