Why do mice eventually become "retarded"? I mean you buy an optical mouse, but this is a problem for mechanic ones as well, and after a few years it starts gradually fucking up. It's no longer as precise, the cursor remains behind, until you eventually move the mouse around and the cursor remains still and unresponsive.
Seems my 2nd razer naga of 3 years of age just got the first signs of Alzheimer as the cursor has small halts when moving it around.