Ask HN: Is Safari losing your sessions?

Is anyone else experiencing frequent loss of sessions when using Safari 4/5 while logged into web sites?

I have noticed, as have co-workers, and customers, that when using Safari 4 or Safari 5, we are getting kicked off numerous web sites prematurely.

At first I thought it was a bug in my sites' session handling, but I now suspect that this is a general Safari bug. It's almost impossible to find anything on this via Google, so I am posting here.

I am getting kicked off every few minutes and sometimes even after just a few seconds.