Second time I use my M8X and I noticed a black key moves sideways. I enclose a video I made today. Any ideas to fix it?. I have created a Yamaha service order and contacted my official store in Spain without any answer.
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Something is likely broken inside and will need service to find/fix the problem.
The link was removed but keys should NOT be able to move sideways except for a very slight 'wiggle' if you move the top of the black key side to side.
Any movement more than that means something is missing or broken inside. Contacting service is the right thing to do especially if you are still under warranty.
Unfortunately some of the service centers I have contacted have admitted that although they are authorized to service the Montage M series they haven't actually performed any service work yet and don't even have the service manual yet. Your center could be one of those.