I am using a 40mm diver watch with a Seiko NH35 Movement, and I’ve had it for a few days. I once left it at night after winding it up fully, and came back in the morning to find the balance stopped, with the time showing a few hours after I left it. I wound it back up, and had to give it a shake to set it moving again. After that, I was able to leave it for 8 hours, but it’s already 7 minutes behind. What should I do?
