Keys are sticking A515-51-513F

Calicocat

The w,e,r keys are suddenly sticking on my A515-51-513F laptop. With repeated efforts, I can get the e and r to work but the w is dead.  Nothing has been spilled onto the keyboard.  Is there anything I can do, other than use another keyboard (which I had to use in order to type this)? The laptop works perfectly other than these three keys. 

(Thread was edited to add model name to the title)

JackE

Usually caused by hygroscopic debris (aka food crumbs, etc) clogging the switches under the key covers. Usually worse when ambient humidity is higher. Response can often be improved by gently manipulating a soft bristle blush brush under the key covers to try loosen the debris from the switch mechanism while blowing air to help remove it.  Be careful not to dig too hard under the key covers because it's difficult to get them back on the switch mechanisms once they pop off. As a last resort, a new replacement keyboard will be needed. While replacement keyboards are faiirly inexpensive (less than about $25usd), some tedious disasembly would be required.