Is this with the radio or with an AUX device. The only time I have any delays from the steering wheel is when I'm starting my Android's music player via the Bluetooth PDIM.
What happens when you press and hold the steering wheel volume up/down controls? I have noticed that a single press does very little, but pressing and holding will quickly change the volume.
This may be a bad switch in the steering wheel. That's not normal. If you're under your B2B warranty I'd take it in and demonstrate this to your service advisor. Since your car works both normally and abnormally try to demonstrate the difference.
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