I recently purchased a Sony STR-DN1070. I successfully set up the Main Zone with a speaker configuration of 6.0 (includes an extra rear surround speaker). I also hooked up outdoor speakers for Zone 2. The problem is that I am not having success with playing each zone independently (i.e. a movie in Main Zone and music in Zone 2). When I turn on Zone 2 and play music, the Main Zone automatically switches to the same, as opposed to maintaining what it was originally playing. Please advise.