I posted about a month ago about my small letter I, O, & S key and the space bar not working most of the time in portrait mode. Worked fine in landscape. After a restore and also reinstalling ios12 still had the problem. Genius Bar had no idea either. Took it back and switched it for another new one. Guess what same problem. Worked with Apple and they seem to think it was a hardware problem as I reset it back to factory and set it up as new with no other software. Still did it. Find it hard to believe I got to bad units when first one came from factory and 2nd one from local Apple store 3 weeks later. So returned it today on final of 2 week return period. Going out of town till first of year and will try again. I watched numerous times as I hit those letters and nothing happened. I can’t be the only one with this problem.