Key needs a lot of force to type

I just gota SAMSUNG RF711 Series Keyboard .



It was working ok but now my P key hardly registers unless I press real hard.



I took the SAMSUNG RF711 Series Keyboard key button off as well as the O key to compare and have noticed that the P one has a clip/ bracket (I don't know the best way to describe this) slightly raised than the O key.



However there is no way to press it down or clip on to anything.



I know this post is vague but any ideas?



When I get time I could try and post images.



Any chance that perhaps some food (or other) particles got under the key and jammed it up? It's surprising how often I run across this problem only to find cracker crumbs (or similar) all jammed up under the SAMSUNG RF711 Series Keyboard keys...



Help much apreciated