Does radio need to be turned off in a 2005 Toureg VW when sitting not running?

What is your question?

I let my car sit for 3 or 4 days and the battery went dead. I charged it, started it and gauge shows it is at 14 volts. Next day dead. In the course of looking for an obvious drain I noticed that the radio remained on with the key removed. I turned the radio off and it has started the last 5 or 6 times I tried even sitting over night. I am still nervous about this. I have a new Battery so I do not suspect the Battery.

What makes this problem better or worse?

It has only happened when the car sits overnight

How long has your 2005 Volkswagen Touareg had this problem?

5 days