Thanks Helen for your reply.

According to what our customer said there isn't a lot of work going on
on that database when the problem occurs. It happens at times when
only very few people are connected to the database.

And because you mentioned "out of memory": This customer we are
talking about also had memory problems. The database's buffer size was
too large. So trying to attach to another database on that server
failed. So we advised them to make the buffer smaller. And so they
did. Now they can invoke another database connection. But maybe they
still don't have enough memory - causing THIS error!?

BTW, our customer just updated to 2.0.3 but the problem still exists.

Would it help to run a debug version to gather more infos? BTW, is it
good idea (in this situation) to run a debug version in production
environment?

--Heiko