Quite normal. Even back when the CL9 first came out (mine is a 2004), we would experience some struggling to start when the engine was warm. We suspected that there was some residual fuel in the cylinder when you shut the engine off and hence was a bit more difficult to start when warm. Cold starts were no issues. Fast forward 12 years later, it still happens once in a while, but what I do is just let it idle for about 10 seconds after stopping before turning the engine off.