STO crashed (that is okay, it doesn't do this kind of crash very often). After the crash the cryptic error reporter popped up asking what lead to the crash. After entereing the information the reporter started (hidden in the tray so I was not aware of it) uploading a full dump of the crash. That dump file is about 1GB large!
See here:
Do you really analyze dumps that large? And how much a day do you get that size?