This afternoon I ran into an issue that I have seen before, but haven't seen for a while that got me to the point of wanting to go and fix the issue. The problem that some of my quick keys, which I hold down, that allow me to maneuver around my screen (option), or retain my aspect ration when scaling items (shift), or quickly switch to my arrow tool to move items (command). This had happened me a while back on my last MacBook but I never really tried to troubleshoot it, I just dealt with it.