Control room monitor out plays monophonic

Why the control room monitoring plays monophonic?
DaVinci has default settings for sound. Audio source is stereo.

If I set Main bus to Audio Outputs in Patch Input/Output, the sound plays stereo.
But I do not want to set every timeline again and again to hear the sound right

Oh, restart helped.

The issue is sometimes return back.
I have to reboot DaVinci every time to fix it.

(no plugins are applied to the audio)