Lately, evernow and again we'll recieve a call from a user who is having connectivity issues. Upon further inspection, we find that they are simply unable to resolve hostnames both localy and externaly. They can always ping IP addresses and recieve valid ip/dns/gateway addresses. All it takes is a simple release/renew to fix the problem but it can be a handful to deal with when we have other problems/projects. What could be causing this? It almost always happens after a reboot but not always.