Which client are you running? See this:
http://www.eqemulator.net/wiki/wikka...ClientVersions
If Titanium, you probably have a multi-core CPU issue and need to check the FAQ in my sig for some solutions. If SoF, then you may want to consider upgrading to SoD or UF. The SoF and Titanium clients are not nearly as stable as SoD and UF clients are. They also don't support newer hardware and OS's nearly as well as the newer clients do.