for some reason today my 4 of my keys have stopped working, and the worst is that one of them is the * key so i cant unlock it to do anything. has anyone else had the problem and know of a fix? i did drop it friday but its been fine all wkend. they button click when pressed as normal so it doesnt feel like theres something thats got in, and they do all occassionally work for a minute or so. its driving me mad, and my mum gave away my spare! so im stuck :( any help greatly appreciated.