our users have the problem that the notes client is closed with NSD when surfing on different websites. It is not reproducable but happens quite often (1 or 2 times per day).
I could provide some NSD-Logs, but didn’t find a way to add it to my post 
We use Notes 6.0.2CF2 and Domino 6.5.4CF2. Or clients are Windows XP Pro SP2.
The problem is also seen on Notes 6.0.4 and with Domino 6.0.4