It is interesting that a new computer fixed the keyboard concern but I think we need to identify how to duplicate the concern. This is with my Surface Pro 11 where I can duplicate the keyboard concern 100 percent of the time. 1: Shutdown using Windows "Shut down". 2: Fold keyboard/cover over display/screen immediately. 3: Wait overnight before using computer. 4; Lower keyboard/cover and turn on computer with the power button. When the computer boots, the keyboard should be unresponsive. You don't even have to try the keyboard. You could tell by the size of the icons in the task bar, they are larger.
To avoid this from happening. 1: Shutdown using Windows "Shut down". 2: Delay folding keyboard/cover over display/screen by a few minutes. It should start up with the keyboard responsive.
Or, sometimes I don't have the time to wait to do the above. This is the procedure when starting the computer up the next day. 1: Press power button BEFORE lowering keyboard/cover. The keyboard should be responsive.
If a new computer did actually fix this keyboard concern, Microsoft will have a lot of computers being returned since all of the computers are still under warranty. I won't be returning my computer even if a new one does fix it for this keyboard concern being I can adapt to the above and I don't want to get a computer back with a different concern.