Yeah, I've noticed it too.
Things started to go down hill in January, and by this point the board is a complete shadow of itself.
It will occasionally produce something of value, usually directly surrounding Q drops, but otherwise it's just noise all day.
I think the expository phase of Q's drops has mostly ended, which would explain a lot about the drop off. Once public exposition begins of the info we have been given, I would guess the quality and quantity of anon contributions will go up again.