I'm not a teacher (not currently even a pupil), but surely the bulk of the responsibility doesn't lie with your teacher, it lies with you.
I find that if I'm in a slump, spending some time playing stuff I really enjoy is good, and having a bit of a look at stuff I'm looking forward to playing later also serves as inpiration. We all have periods of plateau when learning a new piece, when things don't seem to be progressing at all, and the piece has lost whatever original charm it had. You need to remember that things will get better, but you also need to have some fun to keep your spirits, and motivation, up.