Of course, I never wind up working on it. I suck at working on music at home, it feels too much like homework. Then I go into the next week's rehearsal, and it always goes amazingly well, and usually keeps going well through the concert. I've got no idea how it happens, because I didn't do anything to make it happen. It also happens every single concert prep, usually with the exact same timing.
Well, last week's rehearsal was about a month before the concert. It went...poorly. This week's, polar opposite. I still don't have any explanation. The way the mind work completely eludes me.