Sometimes printing & localhost not working

[Jim Byrnes]

I upgraded from 9.10 to 10.04 about 6 weeks ago.  Two weeks ago I had my 
first crash in Ubuntu.  I was gone for about 4 hours and had a number of 
things open at the time, Seamonkey, XP in vbox, Jedit a terminal, 
Nautilus, etc.  When I came back I had a black screen and I couldn't 
bring up the desktop.  At first I thought I was just stuck in the screen 
saver, then I realized the machine was not running.

I restarted it and Seamonkey loaded and said sorry for crashing and 
everything seemed to be OK.  Later I tried to open XP in vbox and 
received an error message.  It also told me how to fix it and I was able 
to get it running.  Since then a couple of times I have not been able to 
use localhost or print.

I have Apache and Mysql running on my desktop and use a small web app 
via Seamonkey to connect.  When the problem occurs I get the message 
"connection refused when attempting to contact localhost" and if I try 
to print from any app my only option is to print to file.

Rebooting fixes the problem but I know that's not the Ubuntu way, so 
when this happens how do I start to trouble shoot it?

Regards,  Jim