I once dropped my Rolex on the floor and about a couple of days later, I noticed that the power reserve was low. The watch was also making a sound as if something was hitting the back of the case. It actually was as I could feel each bump go through. I took it to Rolex for a service, it was obvious that the rotor had become loose due to the inability to wind correctly.
I did notice something a couple of months back too. The watch does make the same sound. In fact, I took my watch in to the RSC and the watch maker didn't notice anything.
Anyhows, looks like you are already putting it in for a look. Let us know what they find.
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