The 5x4 array misses most short button presses. If you hold a button down, it sees it and lights up. But if you more quickly press and release, it never sees the actions.

Not sure why the response time is so bad/flaky.  We upped the i2c speed to 400khz so that shouldnt be a bottle neck - not that it would be.   For near term we are calling it a Feature, because the beast goes live at event in 1 week.