Agreed, however I don't think this is a network problem so much as a poor platform problem. I've always had issues with Steam and it's stability.
I have issues with it on my piece of sh*t laptop, and part of the problem is because I rarely run it to update it. But on my desktop it runs on startup and I've had absolutely -ZERO- problems with it. No crashing, no freezing, etc. I can't remember anything bad happening ever.
Is your computer crappy? Also, you can tell it not to update programs iirc. Can't remember if you can make that setting a default or if it has to be done per update though. Edited, Dec 25th 2011 3:41am by Deadgye