I understand that principle and I thank you all for the commentary. My only curiosity and confusion is why this occurs so randomly and when the server is generally not having high use (web, imap, ftp, etc.. are not being hit too hard).
It seems as if there's some memleak or something somewhere.
RAM has been on this list and I'll get some more put in tonight to test it out at least temporarily.
ISPC3 on Debian! It's great!