One of the pilots is heard asking the other why he "did the cut-off". The other pilot, it says, responded that he did not do so...

This is still not enough for speculation, but along with the fact that they left no notes or guidance for Boeing, makes the situation very strange.

No guidance "at this time"

https://news.ycombinator.com/item?id=44536459 - Another discussion, 8 comments right now.