well you are not alone. Check on the Apple discussion forum. 10.3.8 has caused lots of problems to a number of people, in particular system crashes, I believe these days people talk about "kernel panic", whatever, fact is you've got to restart the whole thing. Very annooying, I had had my Mac on for ages w/o a glitch, until I upgraded to 10.3.8 and now I have a dead computer every third time or so that I wake it up from sleep. So, sorry no real help, but on the forum there are a bunch of suggestions. The reality is that there is a bug in this update, which affect only certain systems. I have read somewhere that 10.3.9 is around the corner, true or not I have no idea. Good luck