I have a 2 year old SKX007 that I've attempted to regulate several times. The last time about 2 months ago I was right on. It picked up a second or two during the day and lost about the same amount at night and I've always worn my watch when sleeping. For the past couple of weeks it's picking up a second or two during the day like it was originally, but now is gaining 10-20 seconds overnight while on my wrist. I don't think my sleeping habits have changed. I know that I could try it off at night and I will, but I've worn a watch to bed for 50 years. Any ideas?