Excessive noisy/rattly keys is an indication that the damper felt has reached the end of its useful life.
For most makes and models, this is a relativey simple process to replace the felt(s). Typically, under normal use, felts will last around 5 years. However on some Yamaha Arius models, key rattle may become apparent before then depending on use. The damper felt is easily replace and not too an expensive job. The action of your digital piano will feel like new again. If you have this problem, complete the online Enquiry Form, remembering to give Make & Model and serial number if possible. We will then be able to email you a quotation to rectify this problem.
Alternatively simply email firstname.lastname@example.org