windows - Keyboard strange behavior

I have a ASUS R900V laptop, 1 year ago, I spilled a small amount of water over the keyboard, and it started behaving strangely, writes aq when I push a or q buttons, and some other thing like this...
I started using an external keyboard, and after a month it started working well again.
Now, after nearly a year, the keyboard started doing this crazy thing by itself againm I thought it was a hardware issue, so I brought my external keyboard again, but the strangest thing is that, the internal keyboard works fine for like a minute after I turn it on, also randomly sometimes, so maybe it's more like a software issue, but the problem is still even after formatting my pc