This month was a first for me. My reason report shows hundreds of "Error: block_month violation" and I ended up with my first PN in over 4 years. I guess it couldn't complete in a higher layer with the good trips I was bidding because I'm flying too much... I'm always very careful about my bid and checking report/release times and making sure everything I'm bidding in the top layers works out. I never took into account something like a block time per month violation.