Yesterday I discovered I couldnt scroll to the last line anymore in the status window.
I could drag the slider only halfway down, going further made the slider jump back to the beginning.
Since I needed timestamps of some occurences, I did a /savebuf to a file. Surprisingly, the file contained 146885 lines - 4735k (my windows buffer is set to only 2500), and I discovered it contained x times the same text, and also still missing the last 2 hours I needed.
And that's all I can say about it, it just happened, clearing the window solved it.