The G27 upshift paddle skips gears

My upshift paddle skips gears. The downshifts works just fine. The wheel is 1,5 years old and my third G27, and this is the first time i see this problem. And it seems the glitch (or faulty gear sensor) I am going bananas :-(

If the gear sensor is at fault, where can I order a new one? Shipping the whole wheel seem a bit dafed and a hustle i either want or need. I pay whatever it costs, almost