That's weird i have an auto selection, so i guess nothing to worry about on your end
I'm scratching my head on the usefulness of the auto feature with the direct/pure button you have, especially since it's to have the avr decide to make it less direct/pure....so I looked it up in your manual. It's called Auto Surround Playback, p.118 of the manual, which says:
Auto surround playback
This mode detects the type of input digital signal, and automatically
selects the corresponding mode for playback.
Perform stereo playback when the input signal is PCM. When the input
signal is Dolby Digital or DTS, the music is played back according to the
respective channel number.
1
Press PURE to select “Auto”.
Auto surround playback begins.
0
This can also be set by pressing PURE DIRECT on the main unit