I've had chronic problems missing downshifts with my LCD upgrade. I've had no trouble with the Bolton display/button pad on my Radrunner.
On my Radmission two days ago, I noticed that if I held the down button 1/2 second or longer, it would fail to downshift. If I held it 1 second, the motor would start in walk mode. I tried it several times. That's much quicker than my Bolton unit, which requires 3 seconds for walk mode.
Yesterday I tried it again. This time it took approximately two seconds to enter walk mode, and now I had approximately a second, not half a second, to let the button up if I wanted to shift down. I tried it several times with the same results.
How long does yours take to enter walk mode?