Today I had a Marriott reservation completely disappear from my account. It had been showing as an upcoming stay, and then a few hours later, it was gone. It isn't shown under my canceled reservations, either. I called the hotel to see if they saw the reservation, and they said that they didn't see it anymore, but that they know it was there earlier in the day (the gentleman I spoke with knows me and said he noted my name on the checkin list and had pre-blocked me an upgraded room). Fortunately, they were able to make me a new reservation with no issue, but this could have been a real issue. Anyone seen anything like this before?