My watch developed a problem just after the warranty expired

Eleven days is painful. What brand is it? Some of them have a bit of flexibility if you ask nicely and the defect is clearly not wear and tear.

Losing 40 seconds a day plus a rough rotor soundus like it could be a bearing issue or the movement needs a service sooner than expected. Skeleton watches are not great at hiding grit either. I would get a quote from an independent watchmaker before doing anything else.

Did you buy it with a credit card? Some cards extend the manufacturer warranty by up to a year. Worth checking before you pay out of pocket.

Push the bradn directly. Dealers often default to the warranty date but the brand may offer a goodwill repair if you are polite and describe the fault clearly. Keep the emails short.

Skeletonized movements can be more sensitive to dust and moisture because there is less material around the plates. If the caseback seal is marginal, that could explain both the timekeeping and the rotor noise. A watchmaker can pressure test it.

Honestly if it is a microbrand the service cost might be a large fraction of what you paid.Get a quote first. Some independents will diagnose for a small fee.

This is why I stopped buying skeleton watches with in-housw movements. Parts availability becomes a nightmare five years down the line.

That is a bit dramatic. Plenty of standard movements are skeletonized and parts are easy to find. The issue here is timing, not the concept.

I had a simi lar thing happen with a warranty that lapsed by about three weeks. The brand ended up covering the part and I paid labor. It is worth asking even if the dealer already said no.

Good plan. Keep us posted on what the watchmaker says about the rotor. I am curious whether it is the bearing or something loosened up.

Fair enough. I still think skeleton movements are a maintenance commitment, but I hope the brand helps you out.