Thanks for reporting your experiences. I'll be happy to pass this information to the appropriate department. However, I haven't heard too many instances of this happening, so it may just be due to the slower connection.
I am using Samsung Series 8 LED TV (UA46B8000XR) and I think there is a bug in the internet@tv software. I have upgraded to the latest firmware available (ver.2005.0).
Recently I tried to install Facebook widget and due to a rather slow internet connection the downloading took a bit longer than other widgets. However during the downloading phase the whole internet@tv disappears. I think it is a feature to exit internet@tv when the user is idle. However if I keep pressing different keys while it is downloading, it does not exit