For a few months now I've had this problem where I would randomly miss shifts, it could be up or down shifts and sometimes it would double shift too which would end in spins when it happened whilst going down through the gears. I changed a plr setting to stop the double shifting, that solved part of the problem, but sadly not all. Basically i stopped using it and even took it apart to try and solve the problem but could not get to the inner gubbings of the paddles to see what was the cause, so put it back together and left it on the shelf and didnt drive the ow cars. Then came the new car from isi, the FR3.5, and i thought to myself i got to fix this thing, i was more determined than ever lol so what i did is put some pressure on the paddles so to bend them away from the back of the wheel, which kinda helped because it stopped me missing down shifts, but still kept missing up shifts, but it wasn't as bad as before, but then whilst i was driving round Silverstone all of a sudden the paddle felt strange and loose and i couldn't shift down what so ever no matter how much pressure i put on it. After a quick look I noticed that the spring behind the paddle had fallen out of the bit where the button thingy is but it was still attached to the back of the paddle. What seems to have happened through wear and tear other time is ive been slowly bending them towards the back of the rim at the same time compressing the springs making them smaller so when i bent them back the springs no longer fit properly and its the springs what push the button on the back of the rim to change gear not the paddles. Any way i took them out and got two flat head screw drivers and stretched each one to maybe an inch, just over, and put them back in and hey presto, i have not missed a shift since. Maybe i was to heavy handed with them, i did use it a lot as it works well with the Megane and GT cars too, except the 370Z. But im glad to have sorted it now, maybe someone else has had this problem, and this post helps them i hope, now or in future.