Had a weird experience yesterday evening that I realize now was trying to book flights in the middle of a schedule change. First I booked my family using points on our desired flight and then when I went to pay for my flight I got an error. Tried again, same thing. Then when I went to search for flights, the flight my family was on was gone altogether (!). I went into their booking and it was still there but the seat map didn't work. Woke up this morning and their reservation has a notification of a schedule change. Never had that happen in real time before while I was trying to book.