Hi, Im new to the forum and I purchased a Ball Engineer Pioneer II about a month ago. This is my first COSC chronometer piece and Ive noticed that usually its +3/4 seconds per day, which to me is really accurate. However, Ive also noticed that certain days, after winding it up from a stopped state, its jumped +8 to +10 seconds in a day (happened 5 times in 4 weeks). I put this watch on a winder for 36 hours when I was wearing one of my other watches and when I took it off the winder it was +20 seconds. I wound and wore the watch 12 hours prior to placing it on the winder and it was +4 seconds. That was 3 days ago and since then its been +3 to +6 seconds per day. I know other watches can vary up to +/- 30 seconds per day but does this operation sound normal for a COSC watch or should it be more consistent? Or am I just being nitpicky? Thanks for your help!