during the last weeks the audio quality output of my Inspiron 660 has got worse.
Either when I use the headphones or a speaker, both front panel or rear panel connected, it happens that the sound distorts, or switch mono to stereo and vice-versa, or it happens also that the volume go up and down or that. That happens with any kind of source (radio, youtube, audiofiles, spotify,...) and if I listen to the same source with my tablet or smartphone, sound is ok.
Drivers are updated.
I'm not an expert of pc stuffs, I'm just thinking to buy a new sound card.