I have also noticed the same thing. It's like it goes into hibernation, but I'm still connected.
It doesn't appear to hurt my shares as I often check the moniter tab and it seems ok. It's not like the shareing stopes. Thats my observation.
Check it out and let us know what you find.
My Lite Blue Connection Bars become a very Dark Blue and when I click the connection tab, it's looking for hosts. While this is taking place there are a couple that have remained but then makes a full Turbo connection after I have woken it up.
Just a side note: Please Edit Out your Personal Email Address, unless you are ready for what might happen. A lot of Freaks out there.