pop3 dying

[mick]

I've got a qmail system in which pop3 dies after about 30 minutes of use.
The system load average in low, can't see any obvious run away process,
the rest of the system works fine (sshd, smtp, http, ftp). killing all
qmail process's and restarting gets it to work for about another 30
minutes....
Any suggestions as to where to start looking?

*****************************************
Mick Dobra
Systems Administrator
MTCO Communications
1-800-859-6826
*****************************************