Recently serviced Sub 16610 dilemma

[walds11]

I recently had my Sub 16610 serviced by a local independent watchmaker that was recommended to me. I thought he did a decent job, but when I got home the day I picked the watch up, I noticed some dust and lint on the dial. Went back down and he cleaned the dial off. Now the problem is the watch slows down or stops early in the morning. For example, I woke up just before 5am this morning. The watch was keeping good time. A few minutes later, I noticed that the watch stopped. I wear it all day and night and only take it off when I shower. This happened a bunch of times. I gave the watch to my dad to give to the watchmaker almost two weeks ago (convenient for me to do that as my dad works downtown near the watchmaker). My dad said it was running fine the few days he had it. The watchmaker did some testing and said it was fine. I got the watch back from the dad this past Thursday. It stopped three times since then! It should not be doing that. At this point, the watchmaker needs to tear the watch down to find the problem instead of just "testing" it or give me a refund. He is tough to deal with, so not sure if he will give me a refund, although he does guarantee his work, what ever that means. I ran the situation by Rikki the TechXpert. He said it could be an auto winding or balance wheel problem. What now? Chalk it up as a loss and go to a different watchmaker to get it fixed or insist that he fixes it?