MailScanner hangs once a day (2)

[Sergio García Caso]

Hello,

I have installed MailScanner 4.54.6 with Postfix 2.3, SpamAssasin 3.1.3 
and ClamAV 0.88.4 in a Mail Gateway with Ubuntu 5.10.
The problem is that MailScanner hung once a day until last Wednesday so 
I had to restart it  (/etc/init.d/mailscanner restart).
Since last Wednesday until today MS has worked OK and it hasn´t stopped 
but today it has stopped at 10.24 AM.
 
I get the following info in the log ('mail.info'):

...
Sep  5 10:24:29 localhost MailScanner[29417]: Requeue: 077812B4600.91241 
to 839CF2B4E59
Sep  5 10:24:29 localhost postfix/qmgr[13147]: 839CF2B4E59: from=<>, 
size=76801, nrcpt=1 (queue active)
Sep  5 10:24:29 localhost MailScanner[29417]: Uninfected: Delivered 1 
messages
Sep  5 10:24:29 localhost MailScanner[29417]: Virus Processing completed 
at 3315169 bytes per second
Sep  5 10:24:29 localhost MailScanner[29417]: Disinfection completed at 
1244272545 bytes per second
Sep  5 10:24:29 localhost MailScanner[29417]: Batch completed at 28507 
bytes per second (77131 / 2)
Sep  5 10:24:29 localhost MailScanner[29417]: Batch (1 message) 
processed in 2.71 seconds
Sep  5 10:24:29 localhost MailScanner[29417]: MailScanner child dying of 
old age
...

And then MS doesn´t appear more in the log.

Can anybody help me?
Thanks.