computer slowing greatly

[Ronnie Tucker]

Hi!

Is there a way to see what was last running and possibly screwing up my 
last KDE session before the last power down?

Just randomly my computer will slow down to where it looks like the 
pointer is moving at about 2fps. I can't click anything, and if I press 
caps lock on/off it takes several seconds before it registers on my 
keyboard light. When it happens I'm not running anything I wouldn't 
normally be running, and it's completely random. Sometimes it won't 
happen for days, but some days (like today) it'll happen several times. 
Hence my email.  :D  In the end I have to just power off the machine as 
I can't type/click so can't log out or Ctrl+Alt+Backspace.

Any ideas/tips would be most welcome.

Thanks!
Ronnie