qpopper4.03 lock file - how to remove ?

[rk]

HI!
Im running qpopper 4.03 on a linux box.
During fetching mail, my connection froze, and my mail server still
holds the lock file .user.pop.
No email can't be "popped" so far for this account (ok).. but when is it going to work 
again ?
Must I set up a cron job (which ??) to check lock files and correct them ?
Is there any kind of automatism build in in popper to correct this ?
Im running qopper from xinedt with ca. 1000 successfull pop's a day, config as 
follows...

service pop3
{
        instances      = 15
        #log_on_success = HOST USERID DURATION EXIT
        log_on_failure = RECORD
        max_load       = 2
        per_source     = 5
        cps            = 10 10
        flags       = REUSE NAMEINARGS NOLIBWRAP
        socket_type = stream
        protocol    = tcp
        wait        = no
        user        = root
        server      = /usr/sbin/tcpd
        server_args = /usr/sbin/popper -s
}