Interesting, I just had someone book my room for 2 months for the first time. Sounds like you had enough. I would talk to a supervisor. It seems like since I became Superhost my support is terrible. They were great when I was a nobody. I told them that when I had an ongoing issue they kept saying was a tech issue and a ticket was submitted but I just had to wait until they get to me. Almost a month of no bookings! I finally asked for a supervisor. It was a simple 2 minute fix and something I did wrong when I updated my bedroom photos.
In the meantime, I guess the work around I will do thanks to you mentioning this is unblock a night an have my guest rebook a night here and there during their stay. What a hassle! Luckily, these girls are adorable and love me and won't mind but that could be a real bother to other guests.