I have a Dell 15R laptop which is about 6 or so years old. Generally its fine but recently the keyboard randomly plays up - usually the top row of letters stops working, most of the time if I just keeping tapping the key I want it eventually works and then is perfectly fine. Sometimes its only half of that row. Tonight the bottom line of letters are playing up - keys only maybe 25% of the time on first press, sometimes takes 10 presses to make it work, other times it works second press. Until ow its only ever been the top row. USB keyboard works fine, on-screen keyboard works fine, various malware scanners find nothing (I'm thinking keyloggers etc) I can get a replacement keyboard for about £15, it can't e much else other than failure of the keyboard itself can it ?