Mixer mutes volume device randomly

Hi. Lately, i am having issues and that happens while playing videos through chromium/firefox with pulseaudio/sndio with OSS backend. That mostly happens while I am working on terminal and mostly using arrow keys on my 60% keyboard with Fn key. After that, when I run mixer I see that volume device is muted and it resolves after i run mixer vol.mute=off. I don't run desktop environments but dwm window manager. I am on 14.2-RELEASE with graphics/drm-515-kmod. I am using wired headphones which has colorful jacks that i plug into rear analog of my PC. I am using latest package repository. I don't remember if it was the same before upgrade, on 14.1-RELEASE. I am not sure about the source of this problem. Thanks in advance.

Code:
% cat /dev/sndstat
Installed devices:
pcm0: <ATI R6xx (HDMI)> (play)
pcm1: <Realtek ALC887 (Rear Analog)> (play/rec) default
pcm2: <Realtek ALC887 (Front Analog)> (play/rec)
pcm3: <Realtek ALC887 (Internal Digital)> (play)
No devices installed from userspace.

% uname -a
FreeBSD hale.home.arpa 14.2-RELEASE FreeBSD 14.2-RELEASE releng/14.2-n269506-c8918d6c7412 GENERIC amd64

% mixer
pcm1:mixer: <Realtek ALC887 (Rear Analog)> on hdaa1 (play/rec) (default)
    vol       = 0.84:0.84     pbk
    pcm       = 1.00:1.00     pbk
    speaker   = 0.74:0.74     rec
    line      = 0.01:0.01     rec
    mic       = 0.67:0.67     rec src
    mix       = 0.74:0.74     rec
    rec       = 0.35:0.35     pbk
    igain     = 0.00:0.00     pbk
    ogain     = 1.00:1.00     pbk
 
I have similar symptoms now and then this year, so maybe it already started with 14.1. Since about a week using 14.2 and similar things happened. PCM dropped from 100 to something lower, VOL dropped too. If I recall mostly when switching to a browser or switching between applications/desktops (I use BSPWM).
 
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