Since I have been started back shooting after shoulder surgery, I have to limit the number of arrows I shoot at a time. Also, I only shoot every 3 or 4 days. I find, after a few warm up shots to loosen the shoulder, I shoot better than before the surgery. However, since things are not totally stable yet, a few shots go askew. Well, I have always had a few shots get away from me, but now I have an excuse.
A break allows muscles to heal as well as the mind to assimilate new things learned regarding form.