SpamAssassin stucked suddenly - Please help

[Dimitris Stefanakis]

Suddenly SpamAssassin stucked and gave me the following logs:

...... MailScanner[24823]: Spam Checks: Starting
...... MailScanner[24796]: SpamAssassin cache hit for message 
l6NBnvC8016299
...... MailScanner[24779]: SpamAssassin cache hit for message 
l6NBaCZh016011
...... MailScanner[24752]: SpamAssassin cache hit for message 
l6NBZvNn015869
...... MailScanner[24823]: SpamAssassin cache hit for message 
l6NC5TOm016520
...... MailScanner[24796]: SpamAssassin cache hit for message 
l6NBnVa0016283
...... MailScanner[24823]: SpamAssassin cache hit for message 
l6NC5UBU016521


and, after that the following:

...... MailScanner[3548]: SpamAssassin timed out and was killed, failure 
2 of 40
...... MailScanner[3499]: SpamAssassin timed out and was killed, failure 
2 of 40
...... MailScanner[3621]: SpamAssassin timed out and was killed, failure 
2 of 40
...... MailScanner[4795]: SpamAssassin timed out and was killed, failure 
2 of 40
...... MailScanner[4293]: SpamAssassin timed out and was killed, failure 
2 of 40
...... MailScanner[4641]: SpamAssassin timed out and was killed, failure 
2 of 40
...... MailScanner[3548]: SpamAssassin timed out and was killed, failure 
3 of 40


What I have is:
Linux: RHEL-4 AS
MailScanner 4.61.7
clamav 0.91.1
SpamAssassin 3.2.1

PLEASE HELP!!!

Dimitris Stefanakis