A week ago I’ve noticed friction between white keys (small-octave B and 1-line octave C) on my Yamaha P37D. It was very noisy and annoyed me. To remove this defect I had to swap small octave and great-octve B keys.
Suzuki is much better made.
When I’ve received my P37D, my impressions was the same. Sticky keyboard as compared to my Suzuki. I was disappointed. But after a couple of weeks the keyboard got used to or me used to. And now Yamaha is my main instrument.