[courier-users] Intermittent Authentication Problem with Courier IMAP

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Has anyone experienced Intermittent Auth problems? I am running courier-imap 1.6.0 on RedHat 7.3 using vpopmail with mysql on the backend for authentication. There is a contention issues with authentication.  Auth will intermittently fail, it seems to be better when the daemon first starts. I have tried to chase the problem in vpopmail and mysql but I have not been able to isolate it any further back than the authdaemon. The mail system supports about 200 users. After trying to change the authdaemond parameters (increasing and decreasing number of processes), I still seem to have issues. Below is my imap configure script. Any help greatly appreciated. ./configure \ --enable-workarounds-for-imap-client-bugs \ --without-authmysql \ --without-authuserdb \ --without-authldap \ --without-authpam \ --without-authpwd \ --without-authshadow \ --without-authcram \ --without-authpgsql \ --without-authcustom \     Bill