Have mine for a few years now, but stopped playing QL for about year and at some point movement keys (in my case arrow keys) stopped working as expected. Sometimes I have to push really hard to get key to respond and sometimes it will count two times (when I play I really push them hard - possibly the reason for their malfunction).

Is there some way to clean them or something so they continue to work or I have to replace the whole keyboard ?

Help is appreciated.