I use this monitor with a PC. I don't have this type of problem. I did a quick search in my "geek" forums: there's mention of minor problems with the picture (which I personally don't have), but nothing to do with the sound.

I mainly use the monitor with a PC and headset. I haven't noticed anything like that when playing with the Nintenso switch.

I don't understand the question, please describe it in more detail. Thank you