Joe, any chance this is something to do with switching off the ignition with the radio still on? As in the auto resume thingy skips the splash in this case perhaps?
I have a question for you chaps too. Do any of you have keyless and the pro nav? If the engine is running and the radio is on, and you open the drivers door, what happens to the nav unit? Does it stay on or does it cut out? A skoda manual I found for a similar unit claims if the door is opened while the engine is running the nav will cut off.
Here is the skoda manual description for clarity:
After switching on the unit, the last audio source and operating mode that was active before switching off will be played.
If your vehicle is fitted with the KESSY system, the unit will switch off automatically after the engine is turned off and the door is opened.
If you open the driver's door before switching off the engine, the unit will also switch off.