I always thought that the performance of a watch in terms of its accuracy should be fairly consistent between certain percentages of power in its reserve. So, say, between 80% and 20%, the accuracy should be within some specified parameters after service or when purchased new. Am I wrong about that? Also, is that the correct range or is it even better, 90% to 10%? Second question. When you own an automatic and you wear it during the day for 12 hours doing various activities, shouldn't those activities be enough to wind the movement 90%+ to full reserve power? I just had a watch serviced and it's failing on both counts and I'm wondering if I should send it back for a redo?