Audio Issue - Mute?

When I start bazzite I have sound, but after a while the laptop mutes itself.
Not sure what could be the reason.
I appreciate any help i can get, tia

Only Happens with internal speakers
Works fine with headphones (Audio is always hearable even after waking up from sleep)

(EDIT: This didn't work, as soon as I got out of Big Picture Mode, I lost my sound again after a few seconds)

According to chatgpt, I should unmute channels on the alsamixer, but for me everything was ok there