If your watch suddenly starts running fast, magnetization is almost always the cause. Try demagnetization first -- it is an incredibly simple and inexpensive fix. Many local watchmakers can do it in minutes, and handheld demagnetizers are available online for just a few dollars. MacBooks have strong magnets right around where your wrist rests, making them a surprisingly common culprit.
If demagnetization does not resolve it, reach out to us at info@lorierwatches.com and we can help you take the next step.