Just bougt a 1080-amplifier a couple of days ago and set it up with "AFD" as sound field just as I always used on my old STR-DH550. But the 1080 keeps changing to "multi st" every time I change source, for instance changing between BD and set top box I need to go back and change sound field. This is extremly irritating, who wants multi st?

Maybe it's something I miss in the settings? Please help!