OK, a failure can happen even to the most modern synths, most commonly caused by a failing component, but finding a tiny polystyrene pellet right inside the contacts of my Elektron Analog Keys keyboard, has been really surprising. The small fluffy ball, found the way through, still in the production phase I guess, as when I opened the keyboard assembling all looked clean and the rubber tops were well sealed. As the warranty had expired already, I had the perfect excuse to check what was inside the only of my “unexplored” synths.
There are plenty of tiny screws to have access to the “insides”, better using a powered screwdriver.
Under the contact pads is where I found the small pellet
Simply removing it and assemble all parts back, the synth’s keyboard returned to working smoothly.