My advice is to be persistent. I believe that RSC customer service is at least equal to Sears - Customer Satisfaction Guaranteed. I had a similar problem with my Sub. It was running inconsistently after service at an independent watchmaker. A local watchmaker put it on their timing machine and immediately noticed some deviation that is not supposed to be there. He suggested that I return the watch since it had a 2-year service warranty. He even suggested that I mention the hairspring. I did, and this time, it came back running very consistently. The watchmaker even included a timing slip.
