Call your dealership and schedule a time with your Service Advisor (SA), ask if you can meet with the shop foreman too. I had the same problem with my USA R56
MCS in November. The place where you insert the key gets damaged if you insert the key upside down (my garage messed that one up, I think), but either way my SA said its a poorly designed part.
Tell your SA you think the CAS (I forget what it stands for, but that's the part), is faulty and you need it replaced. Bad part is the CAS includes the key hole and a computer up inside the dash that controls the start up sequence, key memory, etc. Its VIN specific and will take them up to a week to order it from Parts. This is the only way to get the problem fixed.
If anything, make sure they don't try to pin the problem on you. My car wouldnt start because of a faulty CAS, and I had to get towed from the Dragon. They convered it under warranty.