I've lost count of the number of times I've pressed Ctrl+C to copy something in some Microsoft Office app, flipped to another window or app, pressed Ctrl+V to paste, and instead, it pastes whatever had previously been in the clipboard. Annoyed, I flip back to the previous window, press Ctrl+C again, flip, paste, still doesn't work. Sometimes I have to try this three or four times.
Why does Office do this? It's like it's responding to keyboard shortcuts sluggishly, forcing me to slow down for something I shouldn't have to slow down for, making it generally irritating to use.
I haven't noticed this behavior in any other program. I can't remember if it's happened prior to the 2013 version. I've definitely had it happen in PowerPoint and Word.
It isn't simply stopping. It will stop, and then maybe start again. And then stop again. And start again. (Hence, "randomly".) I don't use Notepad++. I have Skype up, but if it were truly interfering with keyboard shortcuts, it wouldn't suddenly stop interfering. I might try the clipboard lock monitor when I get home, but I can't use it at work. Does it constantly monitor the lock in real time? If it doesn't, it won't be useful to diagnose this problem unless I'm extremely lucky.