The keys have TWO contacts. One closes before the other as you press the key. The processor in the piano MEASURES the time it takes between these closures and uses that as a "key velocity" which is used to control the loudness much like an acoustic piano. When one of the two contacts associated with that key fails, then the key velocity is set to MAXIMUM. The actual failure of the contact can be MECHANICAL or just contamination. The contacts are actually CONDUCTIVE RUBBER "pills" that are pressed onto circuit board traces to complete the circuit when the key presses down on them. The pills are usually in flexible silicone rubber "domes" that also act as springs to help restore the keys when released. Accessing these contacts to clean them is NOT for the DIY person normally. One cleans the pills AND the circuit board GENTLY with 99% isoprophyl alcohol and Q Tips cotton swabs. Opening the piano takes great care and is best left to a repair shop unless one is electronically adept.
Testimonial: "Hi, unfortunately my seller don´t answer on my email, so I have demounted piano and cleaned problematic key contacts. It helps. Many thanks to you."
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