Answer to "iPad Pro 12.9 touchscreen is unresponsive from time to time"The problem seems to be solved in my 2018 iPad Pro 12.9. Soft keyboard does not skip or miss.
Answer to "iPad Pro 12.9 touchscreen is unresponsive from time to time"It seems that the keyboard registration / scanning is displaced from .5 to two inches sometimes. One time, I pressed the “i” button by a “-“ was typed, a full two inches off. Other times, it totally ignores my input. For example, I typed “hoagie” and “agie” was displayed. This is an egregious issue for Apple to solve. I am seriously looking into the Surface Pro. Update (09/26/2018): It clicks, but no caracter is typed. Audible cliks are enabled. I type a character, heard a click, but no character was displayed. I believe this is due to a registration error where the keyboard thinks I typed in the middle of two characters as opposed to the center one character. Apple should have a keyboard calibration app / utility to fix this problem