Headphone sound cuts out (The Elder Scrolls 5: Skyrim)

Good day everyone!
Something I can't find a solution, maybe someone here will tell you something sensible:
I've been playing Skyrim for a long time - a decent game, I didn't notice this before, but now it's like this. I start the game and the headphones are turned off. Even if you just quit the game without leaving it and start some kind of recording, there is sound in the headphones. You unfold / enter the game again - the sound is only in the speakers, there is no sound in the headphones. In general, on this motherboard, when you connect headphones, the sound from the speakers automatically switches to them, but in this game, why doesn't this happen? It is in this game, in others everything is fine: I plug in the headphones in the speakers, the sound disappears, it appears in the headphones.
I would really appreciate your help!