My rcd510 got fouled up. I was actually listening to a CD believe it or not......
The CD must not of seated properly when the car shut down. Upon restarting the car the next day, it came up with a 'slot error' message...problem being everything on the MEDIA menu was locked out as well. Listening to a CD is something I hadn't done in years, but, bought the new TooL album and felt nostalgic. After 1 day of local fm radio......nope..not a chance.
So...ordered this:
https://www.amazon.ca/dp/B07BSP6Y24/ref=pe_3034960_233709270_TE_item
In such a "insert facepalm emoji" VW way the rcd510 is working again today and doesn't know that it's about to be replaced.