I am booking fastpasses this week also,for 30 days out. I couldn't get a Spaceship Earth fastpass when I tried at 7am Sunday morning. I got a Living with the Land fastpass instead and have tried to switch it to Spaceship Earth several times the last few days, but each time the site tells me Spaceship Earth is unavailable. I was pretty surprised that Frozen, Test Track, and Soarin were all available, but Spaceship Earth wasn't!
Not sure what's causing it, but the fastpass site has been extremely glitchy all three mornings I've been on it so far. Both on the website and the app. I keep getting messages saying all fastpasses for all parks have been distributed; something went wrong,try again later; it just spins and won't load; etc. Very frustrating.