Hello, I am the proud owner of a new SMPc, I got it about a month ago. After a couple days it settled into about +1.5 sec per 24 hours. I was extremely happy with that. Checking yesterday I noticed it was running a little slow. Now after 18 hours it is -4, I will check again at a full 24 hours. My question is this, is this normal that they go up and down in accuracy, or should I expect it to stay running slow now? I have not changed my activity or dropped it. I wear it 24/7, I do not take it off while sleeping. What troubles me is that it is running slow, rather than fast like it was the first month of owning.