This problem has popped up before. I have a theory and a possible fix for it. When I had the gauge cluster apart to fix the buzzing, I saw how the reset and select buttons work. When pushing the buttons, it is not a direct contact with the switch. Instead, it pushes against a very small piece of a plastic pin about 3/8" long that rides in a plastic tube. This is a very loose fit with a lot of slop and it may be getting cocked inside the plastic tube. The "drinking straw" repair method for eliminating the buzzing noise could also correct this by reducing the inside diameter of the tube and help to keep that plastic pin centered.