(latest photoshop update installed, windows 10 OS, using a wacom cintiq)
I have experienced my keyboard becoming unresponsive on photoshop only after a few minutes of opening the software. What happens is that none of my keyboard shortcuts work and the canvas freezes, I can't zoom in or out or move the canvas, but I am able to click on the menu. This issue kept happening, even after following the guidelines from Adobe (resetting preferences, etc...).
After researching more, I found out that because I had multiple languages installed on my windows machine, this seemed to cause the crash, as Photoshop didn't seem to know what keys were pressed. I seem to have solved the issue by uninstalling all my language packages except english, but this is a problematic workaround. Could Adobe plese look at this bug for the next release ? I have seen a lot of people complaining about it on my research.