keyboard key sometime doesn't work

[DL-zz]

I own a PC, and I have the weirdest problem with my keyboard. Sometimes a few of the keys on my keyboard would stop working at the same time. So basically, if it's fine, it's fine. If it breaks, then all 3 would break. Then after a while it would go back to normal again. The keys are 'k' and '1', and '7' on the numberpad. Anyone knows what's going on?

 

[quilline]

I experienced the same problem with my keyboard before but not the same letters. It was after I spilled some of my coffee over it then let it dried. I think there are short circuits on it or the trouble could be on the entire keyboard. I ended up buying new keyboard to prevent repeating issues.