All the buttons in the top two rows of my walnut 128 seem to be slower and less responsive than the rest. I disassembled the monome and cleaned the connections with isopropyl alcohol, but the problem remains.
To add, I own both a Walnut 128 (from an early batch) and a GS 64. The buttons on my GS 64 work flawlessly and trigger with little pressure, however on the 128 all the buttons require much more pressure to trigger.
What should I try to do next? Is it possible to make my Walnut 128 buttons as responsive as my GS 64?