When I have been actually trying, I do not think I've died 4 times on the same board (even since I've started seriously point pressing) since my PB was maybe around 80k (the hardest springs stage). When I was just starting DK, I'm sure I died 4 times all-back-to-back several times on 1-1, 1-2, 2-2, 3-2 and 4-4. However, since then, I've only rarely ever died more than 2 times in a row on a board. If I die twice in a row, I usually just restart anyway.