Faulty Ignition Switch

[slappy]

Had the same problem with mine on about 66k miles; but someone wiser than me suggested that because the key becomes slightly twisted through use over time, I should first try straightening the key by flattening it under pressure between the jaws of a vice. It worked for me - might be worth a try before you go through the expense and hassle of a lock change.

I had to do the opposite when I had my gen1, had to slightly bend the key for it to work whilst I sourced another ignition switch.