Last weekend around 2:30am saturday, the master node slon stopped  
processing events. sl_status on that node was not updating the  
timestamps or event numbers.  I thought it might have been some  
vacuum interlocking so killed my nightly vacuum, but that didn't  
clear it up, so I had to kill the slon and restart it.  It took about  
2 minutes to catch up once I did that at 3am (damn I hate waking up  
to the pager!).  There was nothing in the logs either after the 2:30  
mark.  The slon on the replica was still logging cleanup thread  
events so it wasn't stuck.

Anyone else seen this?  Server is FreeBSD 5.4. slony 1.1.5 Pg 8.0.4  
on master, 8.1.2 on replica.