I haven't been able to find any question online which references this issue, so I made sure pretty much before asking the question here.
In any given scenario - unrelated to any application - when I press "CTRL + C" (or cut/paste), the focus changes to wherever my mouse is.
For example, while writing this post, if i copy and given text here without noticing that my mouse is on the window's "X" closing at the top right, it would actually close the window.
this becomes frustrating when you're coding and trying to copy a line and paste it 2 lines after. I usually use the arrow key in such a scenario where I press the arrow key downwards twice. but instead i wouldn't notice the my cursor is someplace else, and I would end up accidentally pasting the cut line in the wrong place.
Now imagine the same scenario in Excel: you copy cell A2, while your mouse is on C4. you expect that pressing the arrow key "down" twice would take you to A4, but instead you're now on C6!
I would gladly provide a video of the scenario, but I'd first take my chances explaining it here. Anyone experience this before? if not, would you know what's going on?
UPDATE: i have discovered it's uniquely a combo key (CTRL+C, CTRL+X, V, etc...) translating to a MOUSE CLICK! (hence the explanation to why it's losing focus). this is strange, and need to solve it :/