[Dovecot] Dovecot pop3 segfault problems

[enid vx]

Hi to all,

I have a Debian 4.0 x86_64 server and installed Dovecot from the
repositories

ii  dovecot-common
1.0.rc15-2etch5
ii  dovecot-imapd                     1.0.rc15-2etch5
ii  dovecot-pop3d                     1.0.rc15-2etch5

Recently I'm getting a lot of these messages

pop3[24594]: segfault at 0000000000000004 rip 000000000044333a rsp
00007fffc5d0c1e0 error 4

in syslog and also dmesg.

Also the load of the servers keeps increasing (like above 100) and when
dovecot is stopped the load decreases.

What problem could this be and how can I resolve it?

Thanks,
Enid