This sounds similar to an issue I've been having for a while. The numrow keys will randomly stop working; the quickest fix seems to be tabbing out and back in. Lately (maybe for the last 2-3 weeks?), my shift key seems to be stuck on, even though I have the sticky keys shortcut disabled. Hitting a numrow key will activate a power in my second tray.
This is in Win 10.
I saw another thread that suggested disabling notifications, but that doesn't seem to have helped.
Did you ever figure out what was going on?