For over a month I was having problems with one of my relays.  It was 
originally running Linux with Host-AP.  It was crashing almost every 
night.  I thought it was something due to the Host-AP drivers.  I've 
heard that they were not good.

So I upgraded the relay to a Soekris running m0n0wall.  This seemed to 
improve the situation, but not solve it.  At certain times of the night 
I would start getting timeout errors over and over.  This would be on 
the AP side of the relay. (/kernel: wi0: timeout in wi_seek to 14a/3c; 
last status 403c)  It would stop the users from accessing the internet.

After fighting with things for weeks, thinking it may be some HAM 
operators in the area, I found the problem.  It had nothing to do with 
radio waves or software setups.  Not even the Firmware was to blame for 
this problem.

Power Save Mode!  I had one customer using a Linksys WMP11 PCI card to 
connect to the relay.  It was setup on Windows XP.  The Power Save Mode 
was enabled on it.  The day I had the customer disable it was the day 
the errors stopped.

Has anyone else had this problem?