<p>After doing a little more checking, I see this “sticky key” problem is fairly common:
[Key</a> issues - A5_OC](<a href=“Key issues | Audi A5 Forum & Audi S5 Forum”>Key issues | Audi A5 Forum & Audi S5 Forum)</p>
<p>And that there is a Service Bulletin that addresses this issue. (I can’t replicate the link. You can access it from the above URL.) Take the car back to the dealer and have them check it again!</p>